Group (-3)Family (-2)Language (-1)Dialect (+1)Script(s)Region / Use
AlbanianAlbanianAlbanianGhegLatinnorth of and near the Shkumbin river
ToskLatinsouth of and near the Shkumbin river
AltaicJapanic (far from Europe)
Koreanic (far from Europe)
MongolicMongoliancommonMongolianGolden Horde
KhitanKhitanKhitan large, Khitan smalldying language of the Kara-Khitan Khanate remnants
Tunguskic (far from Europe)
TurkicArghuKhalaj?just moving to the Valley of Kabul, some Khalaj people joining the Mongols
KarlukKhorezmianArabicGolden Horde
Uyghur (Old Turkic, not modern Uyghur)Old Turkic, SogdianXinjiang region
KipchakBashkirArabic, Old TurkicBashkirs - southeast of Volga Bulgaria
CumanLatin, RovasirasCuman/Kipchak Khanates
Fergana Kipchak?Fergana Valley
KipchakLatin, RovasirasCuman/Kipchak Khanates
Kumyk?Kumyk plateau - on western coast of Caspian Sea north of Shirvan
KyrgyzOld Turkicroughly present-day Kyrgyzstan
TatarArabiceast of Volga Bulgaria
OghurBulgarArabic, OrkhonVolga Bulgaria
ChuvashArabic, OrkhonVolga Bulgaria
Khazar?- (recently dead language of Khazars)
Turkic Avar-- (dead language of Eurasian Avars)
OghuzAfshar?Azerbaijan
AzerbaijaniArabicAzerbaijan
Ghuzz / Turkmen- (Arabic starting)east of the Caspian Sea
Khorasani?Khurasan
PechenegLatin, RovasirasCuman/Kipchak Khanates
Turkish (Old Anatolian Turkish)Arabic (predominantly), GreekAnatolia
Siberian (far from Europe)
ArmenianArmenianArmenianArmenianArmenianArmenian Kingdom of Cilicia
AryanIndicDardicKashmiriSharadaKashmir
Pashayi-northern Ghur - just south of the Hindu Kush
ShinaDevanagariKashmir and northern Ghur - just south of the Hindu Kush
???
Romani-DomaniDomani-?
Lomavren-?
Romani-?
(other Indic languages) (far from Europe)
IranianEastern IranianAvestanAvestan, Pahlaviliturgical Zoroastrianism
BactrianGreek, Manichaean-
KhwarezmianAramaicKwarazm
PashtoAramaicGhur
Scytho-Sarmatian / OssetianGreekcentral Caucasus - around the Bolshoi Zelenchuk river valley
SogdianSogdian, ManichaeanKwarazm, Transoxiana
Western IranianBactrian ParsiArabic, PahlaviBactria - just north of the Hindu Kush
BalochArabic, PahlaviKirman, Makran
KurdishArabic, PahlaviJibal
LuriArabic, PahlaviKhuzistan
Persian / ParsikArabic, Pahlavicourt dialect
Sogdian ParsiArabic, PahlaviSogdia
Tabari / MazanderaniArabic, PahlaviMazandaran
NuristaniNuristaniNuristani?Hindu Kush
Balto-SlavicBalticEastern BalticCuronian-between the Baltic Sea and the Gulf of Riga
LatvianLatin (just starting)north of the Daugava River
LithuanianLatin (starting soon)north of the Neman River
Selonian-between the Latgalians and the Semigallians and the Lithuanians
Semigallian-south of the Gulf of Riga
Western BalticGalindian-south of and between the Prussians and the Yotvingians (Sudovians)
PrussianLatinsouth of the Baltic Sea and east of the Vistula River
Skalvian-around the Neman River by the Baltic Sea
Sudovian / Yotvingian-between the Neman River and the Narew River and the Pregola River
SlavicEast SlavonicNovgorodCyrillicRepublic of Novgorod
RussianCyrillicPrincipalities of Smolensk, Chernigov, Novgorod-Seversk, Murom-Riazan, and Vladimir-Suzdal
Ruthenian (Belarusian-Rusyn-Ukrainian)CyrillicPrincipalities of Polozk, Tourov-Pinsk, Galicia Voyhynia, Kiev, and Pereyaslavl and a little into eastern Hungary
South SlavonicBulgarianCyrillic(Second) Bulgarian Empire
Old Church SlavonicGlagoliticreligious texts
SerbianCyrillic, LatinCroatia, Bosnia, Rashka, Zeta
West SlavonicCzechLatinBohemia, Moravia
Polish-Polabian-Kashubian-SilesianLatinGreat Poland, Little Poland, Lower Silesia, Masovia, Pomerania, Pomerelia
SlovakLatinnorthern Hungary
Sorbian / WendishLatinLusatia, Rugen, Brandenburg, Pomerania
BasqueBasqueBasque / EuskaraBasque / EuskaraLatinnorthern Navarre and a little beyond
BerberBerberTamazightKabyleArabic, Tifinaghmodern Algeria region
Tarifit / RiffianArabic, TifinaghMaghreb and Rif
Siwi / SiwanArabic, TifinaghSiwah oasis in northwestern Egypt
Tashelhiyt-AtlasArabic, Tifinaghcentral highlands of northwest Africa
Tuareg / TamahaqTifinaghdeep south of northwest Africa
ZenagaArabic, Tifinaghsouthwest Mauritania
GuancheCanariaSilbo-Canary Islands: Canaria
Spoken-Canary Islands: Canaria
CaprariaSilbo-Canary Islands: Capraria
Spoken-Canary Islands: Capriaria
HerbaniaHerbania-Canary Islands: Herbania
InvallisInvallis-Canary Islands: Invallis
JunoniaJunonia-Canary Islands: Junonia
NinguariaSilbo-Canary Islands: Ninguaria
Spoken-Canary Islands: Ninguaria
PluvialiaSilbo-Canary Islands: Pluvialia
Spoken-Canary Islands: Pluvialia
CaucasicNortheasternAvar-Andic?-?
AvarNuskhuri, Asomtavruli, Mkhedrulilingua franca for Avar-Andic and Tsezic languages
Dargi???
Khinalug / XinalugKhinalug / Xinalug??
LakLak??
Lezgic???
NakhBatsbi / Bats??
ChechenNuskhuri, Asomtavruli, Mkhedruli?
IngushNuskhuri, Asomtavruli, Mkhedruli?
Tsezic / Didoic?-?
NorthwesternAbkhaz-Abaza / AbazgiAbaza-?
Abkhaz / Abxaz-?
Circassian / CherkessAdyghe / Adyge-?
Kabardian-?
UbykhKaracalar-?
Ubykh-around Sochi
CelticCelticBrythonicBretonLatinBrittany
CornishLatinCornwall
CumbricLatinnorthern England, Scottish lowlands
WelshLatinWales
Goidelic / GaelicConnachtLatinwestern Ireland
GalwegianLatinKingdom of the Isles
Highland / ErseLatinScotland
LeinsterLatineastern Ireland
ManxLatinIsle of Mann
MunsterLatinsouthern Ireland
UlsterLatinnorthern Ireland
PictishPictishOghamdead language of the Picts, used by the Gruagach
EgyptianEgyptianCopticAkhmimic / Lycopolitan / Subakhmimic / AssiuticCopticsome texts
Bohairic / MemphiticCopticdying out in Lower Egypt, new liturgical language for Coptic Orthodox Church
Fayyumic / Bashmuric / Oxyrhynchite / MesokemicCopticsome texts
Sahidic / ThebaicCopticUpper Egypt, most texts, old liturgical language for Coptic Orthodox Church
DemoticDemoticDemoticold papyrus texts
EgyptianArchaic EgyptianHieratic, Hieroglyphicancient texts, tombs
Early EgyptianHieratic, Hieroglyphicancient texts, tombs
Late EgyptianHieratic, Hieroglyphicancient texts, tombs
Middle EgyptianHieratic, Hieroglyphicancient texts, tombs
GermanicAnglo-SaxonEnglishEast Midland (East Anglian)Latineastern England north of the Thames
KentishLatineastern England south of the Thames
Northern / NorthumbrianLatinnorthern England, Scottish lowlands
Southern / West SaxonLatinwestern England south of the Thames
West Midland / West AnglianLatinwestern England north of the Thames
GermanDutchBrabantianLatinCounty of Brabant
Flemish-Zeelandic (different from Low German's Flemish)LatinFlanders
HollandicLatinHolland
LimburgishLatinaround Maastricht
Low SaxonLatinbetween Brabant and Friesland
East GermanBurgundic?-
Crimean Gothic?Gothia
GothicGothicHouse Bjornaer mysteries
VandalicGothic-
High GermanBavarianLatinDuchy of Bavaria
FranconianLatinDuchy of Franconia
Rhinelandic (Hessian-Rhenish-Moselle-Ripuarian)LatinDuchy of Lorraine
SwabianLatinDuchy of Swabia
Swiss / AlemannicLatinKlein-Burgund and many smaller states up to and around Strassburg
Thuringian-Upper SaxonLatinLandgraviate of Thuringia, March of Meissen
YiddishHebrewGerman Jews
Low GermanFlemish (different from Dutch's Flemish)LatinFlanders
FrisianLatinFriesland
PomeranianLatinPomerania
SaxonLatinDuchy of Saxony, Burzenland, lingua franca for Baltic trade
Old NorseEast NorseDanishLatin, RunicDenmark
ScanianLatin, RunicScania
SwedishLatin, RunicSweden
GutnishGutnishLatin, RunicGotland
West NorseFaroeseLatin, RunicFaroe Islands
GreenlandicLatin, RunicGreenland
IcelandicLatin, RunicIceland
NornLatin, RunicCaithness, Hebrides, Orkney, Shetland
NorwegianLatin, RunicNorway, a few isolated spots in eastern Britain
HellenicGreekByzantine GreekCappadocianGreeksouth-central Anatolia
Demotic / koine / commonGreekByzantine (Roman) Empire
PonticGreeksoutheastern coast of Black Sea
YevanicHebrewByzantine Jews
Classical GreekAeolicGreek-
AtticGreekliterature of Classical Greece, Biblical Greek
Doric / TsakonianGreeksmall region in eastern Greece near Tyros
IonicGreek-
HomericGreek-
Koine Greekkoine / commonGreek-
KartvelianKarto-ZanGeorgianGeorgianNuskhuri, Asomtavruli, MkhedruliGeorgia (including Tskhumi)
ZanLazNuskhuri, Asomtavruli, Mkhedrulisouthwestern corner of Georgia
MingrelianNuskhuri, Asomtavruli, Mkhedrulicoastal northwestern corner of Georgia (including Tskhumi)
SvanSvanSvanNuskhuri, Asomtavruli, Mkhedrulinorthern edge of the northwestern corner of Georgia (near Dombai-Ulgen)
Romance / LatinateBalkan RomanceVlachAromanianLatinIllyria, northern Greece
RomanianLatinRomanians
Island RomanceSardinianCampidaneseLatinsouthern Sardinia
Logudorese-NuoreseLatinnorthern and central Sardinia
Italo-RomanceTuscanCorsicanLatinCorsica
SassareseLatinnorthwestern Sardinia
TuscanLatineastern coast of the Tirrenian north of Rome
NeapolitanAbruzzeseLatinAbruzzo
CampanoLatinCampania
LucanoLatinCalabria, Lucania
MolisanoLatinsmall region between Abruzzo, Campania, and Puglia
PuglieseLatinPuglia
SicilianCalabreseLatinmost extreme end of Calabria
SalentinoLatinmost extreme end of Puglia
SicilianoLatinSicily
LatinLatinClassicalLatin-
EcclesiasticalLatinchurches
HermeticLatinOrder of Hermes
MedievalLatinEuropean scholars
Western RomanceDalmationRagusanLatinsouthern Dalmatian coast
VegliotLatinnorthern Dalmatian coast
Veneto-IstriotLatinnortheast, north of the Po river, including the northern coastline of the Adriatic, but not into the mountains
Franco-ProvençalDauphinoisLatinDauphine
Franc-ComptoisLatinPfalzgrafschaft Burgund
LyonnaiseLatinLyon and La Bresse
PiedmontLatinsoutheastern Savoy
SavoyardLatinSavoy
ValdotainLatinAosta Valley (eastern Savoy)
VaudoisLatinwestern Klein-Burgund
Langues d'Oil / FrenchAnglo-NormanLatinEnglish nobility, Channel Islands
BourguignonLatinBurgundy
ChampenoisLatinChampagne
LorrainLatinUpper Lorraine
NormanLatinNormandy, eastern Brittany, western parts of Lower and Upper Lorraine
OrleanaisLatinIle de France, French nobility
PicardLatinnorthwestern France
PoitevinLatinAnjou, western Aquitaine
WalloonLatinLower Lorraine
Latina / Mozarabic / Andalusi RomanceLatina / Mozarabic / Andalusi RomanceArabicAl-Andalus, dying out soon and becoming displaced by Castilian
North ItalianEmiliano-RomagnoloLatinwestern coast of the Adriatic north of Rome
Genoese (Ligurian)Latinthin Genoese coastline north of the Tirrenian
LombardLatinLombardy
PiedmonteseLatinPiedmont
North IberianAstur-LeoneseLatinLeon
Galego-PortugueseLatinGalicia, Portugal
Navarro-AragoneseLatinwestern Aragon, southern Navarre
Castilian-LadinoLatin, HebrewCastile, Iberian Jews, diverging soon
OccitanAuvergnatLatineastern Aquitaine
CatalanLatineastern Aragon, just  spreading to the Balearic Islands
GasconLatinGuyenne
LimousinLatincentral Aquitaine
ProvencalLatinProvence
RhaetianLadinLatineastern Tyrol, Friuli
RomanshLatinwestern Tyrol
SabirEasternLatinlingua franca of the Mediterranean
WesternLatinlingua franca of the Mediterranean
SemiticArabicArabicAndalusiArabicAl-Andalus
ClassicalArabicsecular scholarship, poetry, the Qur'an
EgyptianArabicEgypt
KhalijiArabicArabia
LevantineArabiceastern Mediterranean coast
Maghrebi / DerijaArabicnorth Africa west of Egypt
MaslawiArabicIraq, Jibal
MalteseMalteseLatinMalta
AramaicAramaic??some Christians of the Jazira and northwest provinces, liturgical use by Jews
Syriac??written and liturgical use by Nestorian and Jacobite Christians
CanaaniteHebrewAmmoniteHebrew-
EdomiteAramaic-
HebrewHebrewliturgical language of the Jews
MoabitePhoenician-
Phoenician/PunicCarthaginianPhoenician-
KhalidaPhoenicianBanu Khalida in very southern Mauritania
PhoenicianPhoenician-
EthiopianNorth EthiopicGe'ezGe'ezliturgical and scholarly language of Ethiopian Christians
TigreGe'ezEritrea
TigrinyaGe'eznorthern Ethiopia
South EthiopicAmharicGe'ezsouthern Ethiopia, lingua franca of Ethiopia
South Arabian / SayhadicHadramiticHadramiticSouth Arabian-
Minaean Minaean South Arabian-
Qatabanian?South Arabian-
Sabaean / Sabaic?South Arabian-
UralicFinno-PermicFinnicFinnish-very eastern Sweden and north of there (the location of modern-day Finland)
Ingrian?south of the eastern end of the Gulf of Finland
KarelianCyrillic (recently)Karelia
Livonian?southern area around the Gulf of Riga
Merya-- (dead language from around the Volga River near Uglich)
North Estonian?northeast of the Gulf of Riga and east to Lake Peipus
South Estonian?inland southwest of Lake Peipus
Veps?northeast of the Republic of Novgorod
MariHill?northwestern Volga Bulgaria
Meadow-Eastern?north-northwestern Volga Bulgaria
MordvinicErzya-just west of Volga Bulgaria
Meshcherian-dying out east of Moscow and north of the Oka River
Moksha-just west of Volga Bulgaria
Muromian-- (recently died out or nearly so about halfway between Moscow and Volga Bulgaria)
PermicKomiCyrillicnortheast of the Principality of Vladimir-Suzdal
UdmurtCyrillicnorth of Volga Bulgaria
SamiMainland-north of Karelia
Northwestern-northern Norway and north of Sweden from about halfway up to the north end of the Gulf of Bothnia and covering the whole region north of the Gulf of Bothnia and north of the Finns
Peninsular-the peninsula north of the White Sea
Southwestern-northern Norway and north of Sweden from about northern Sweden halfway up to the north end of the Gulf of Bothnia
SamoyedicCore SamoyedicEnets-Nenets-Siberian coast east of the White Sea to the Yenisei River
Kamas-Selkup-central Siberian region roughly east of modern Nizhnevartovsk
MatorMator-Sayan Mountains
NganasanNganasa-Siberian coast east between the Yenisei River and the Kotuy River
UgricMagyarHungarianLatin, RovasirasHungary
TransylvanianLatin, RovasirasHungarian-occupied Transylvannia
Ob-UgricKhanty / Ostyak-southern Urals
Mansi / Vogul-southern Urals

Notes: Languages in italics are considered dead languages. Scripts in italics are scripts that are no longer in use. I've tried to represent very similar continuums with dashes, while writing forward slashes between different names for the same or roughly the same language/dialect.

The above table, while compiled heavily from Wikipedia, was checked for consistency with the Ars Magica line. Several changes from ArM5 canon were made, though. Some of those were with Medieval Greek, as Romaic Greek is a more modern version than the version used around 1200. Most of the changes were within the Romance languages, made based on consistency (e.g. resolving that ArM5 is inconsistent with Catalan.) between suggestions on the Ars Magica forums and my own secondary research. (Special thanks to several on the forums, especially ezzelino.)  There are certainly more dialects than listed; an attempt was made to list the most common dialects. Also, trying to force languages into a structure to match a game is not perfect, which is why many "dialects" listed above are commonly classified as separate languages. Still, the table should be a pretty good representation of the languages used and should be viable for game play.

Characters trying to communicate within the same dialect get to apply their specialties, and so communicate at (language score)+1, each. Characters trying to communicate within the same language but using different dialects communicate at (language score)-1, each. Characters trying to communicate using different but similar languages (within the language family label above) communicate at (language score)-2 each. Characters trying to communicate with different but slightly similar languages (within the language group label above) communicate at (language score)-3. Anything further apart than that is too far for mutual intelligibility at all.

There are a few language pairs where the penalties shift slightly:

Note: There are far too many languages for each to appear as its own RPoL language group, and that's going to be too much of a pain, as nice as the feature is. Just note what language is being used if it's not Latin, and everyone can play appropriately. Also, try to write to reflect the language score used, such as writing really simplistically to represent a score of 1.