The Antiquity Empire of Atar Khos
The Unification Calendar is used in Atar Khos. On that calendar, the current year is 84 SU (second Unification) or 219 FU (first Unification). The current population is around three million.
The existence and accuracy of this calendar is symptomatic of how highly developed astronomy is (for the period) in the Empire.
The majority of Atar Khos is taken up by the Khosan Desert. It is also home to the Ataric Plateau and Grand Khosii River
Architecture
Buildings in Atar Khos are built out of clay or stone, depending on one's budget. The personally wealthy both often boast large, multi-story palaces with many cloth/hide windows. The military build similarly large estates, but they are usually somewhat longhouse-like dwellings arranged on a grander campus ground. These buildings rarely feature windows, except perhaps in the roof.
Timekeeping
The Antiquity Empire of Atar Khos divides the day into eighths. First light or dawn is when the sun is directly to the east (obviously). The first early quarter is when the sun forms an angle greater than 0 but lower than 22.5. The second early quarter is for angles between 22.5 and 45. Et cetera. Eventually, you reach noon or midday when the sun is directly overhead. Then, you have the four late quarters, which are basically the same. 90 to 112.5, 112.5 to 135, and so on. Last light or dusk is when the sun is directly to the west.
Needless to say, normal people would eyeball the angle and not measure it to half a degree.
Breakdown Table:
Measure of AngleTime of Day
Approx. 0°First Light (Dawn)
0° ~ 22.5°First Early Quarter
22.5° ~ 45°Second Early Quarter
45° ~ 67.5°Third Early Quarter
67.5° ~ 90°Fourth Early Quarter
Approx. 90°Midday (Noon)
90° ~ 112.5°First Late Quarter
112.5° ~ 135°Second Late Quarter
135° ~ 157.5°Third Late Quarter
157.5° ~ 180°Fourth Late Quarter
Approx. 180°Last Light (Dusk)

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Long ago, the extremely populous Ataric and Khosii ethnic groups began to develop Clans. Copper metal was found in the mountains, leading to the creation of better hunting weapons. The Clans expanded, and began to butt heads.
300 years ago, the leaders of these clans began to compete against each other, and they formed City-States beneath them. Conflict lasted for four generations (~80 years), before it was settled with the advent of the Unification Emperor
Thus, 220 years ago, the Empire of Atar Khos was founded, with the capital city-state of Imperium ruling over the seven other city-states. The reign of the Unification Dynasty lasted for six generations, but it eventually collapsed.
100 years ago, with the rise of an enigmatic figure named Debrum Voltis, the Unified Empire of Atar Khos broke into civil war. Ten years later, Bronze was discovered, and the bloodshed was immense among the 24 city-states. The conflict lasted for about 15 years, before Debrum Voltis was slain by the Phoenix Emperor at Mount Katharis in the fateful Battle of Imperium. The aftermath was not easy to deal with, but the Phoenix Emperor managed to rebuild. Atar Khos was reformed as the Antiquity Empire, and the previous capital Imperium became the new capital Imperia.
Lineage of Emperors:
Emperor's NameLength of ReignKnown for
Unification Emperor0 FU - 4 FUUnifying the Seven Ancient Clans; Founding the Empire of Atar Khos
First Emperor4 FU - 34 FUDeveloping Imperial culture; Securing providence for the people; Establishing peace between the Ataric and Khosi ethnic groups
Earth Moving Emperor34 FU - 58 FUDeveloping infrastructure; Establishing two new City-States
Great Civilization Emperor58 FU - 88 FUExpanding the empire; Establishing fourteen new City-States
All-Knowing Scorpion Emperor88 FU - 108 FUDominating politics and exerting heavy-handed control over the Autarchs; Writing treatises on law, astronomy and education; Establishing one new City-State
Disaster Emperor108 FU - 120 FUIncompetently failing to maintain the empire during the Twelve Dark Years or "The Gohethia"
Warring Clans Period120 FU - 135 FUWar between the 24 City-States; Emergence of Debrum Voltis; Discovery of Bronze; Birth of the Phoenix Emperor
Phoenix Emperor130 FU - 138 FURestoring order to the empire; Slaying Debrum Voltis on Mount Katharis
Reclamation Emperor138 FU - 150 FUDeclaring the establishment of the 'Antiquity Empire'; Reconquering of territory; Creation of new City-States; Overseeing the development of factions
Great Ancestral Emperor150 FU - 181 FUFavoritism towards the Traditionalist faction; Overseeing a period of stagnation; Self-mythologizing, degeneration of pre-war culture, and reinterpretation of ancient history
Thousand Burdens Emperor181 FU - 196 FUCeding power and authority to the Autarchs and Primarchs; Ineffectively defending against foreign threats
Balance Emperor196 FU - presentReestablishing Imperial authority; Aggressively pursuing foreign threats

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Currently in it's Second Unification, the Antiquity Empire of Atar Khos is comprised of 37 city-states.
However, discontent is brewing. For over forty years, the Autarchs who rule the city-states have been split across four factions:
Beyond the factional lines, there are also geographical lines. Atar Khos is vast, and always expanding. For that reason, cultural and economic differences have emerged over time, based on the distance from the capital city, from which many supplies are administered

Legal System:

Autarchs/Primarchs elect numerous officials below them. The common name for this position is Magister, but it can change depending on the role to be served.
Magisters handle crime amongst the civilians, though they have a reputation for being lazy and ignoring incidents if they can get away with it.

The military is self-governing in Atar Khos.

Though it's rare for this kind of persecution to actually take place, if the outcry or consequences are great enough, or if they have been personally offended or harmed, the Emperor might declare an Autarch to be a criminal. In that case, one can only attempt to run and hide (bringing their close family if they actually care about them), taking what little they can carry. If they are found, the punishment is always death. Their vacant position will be quickly filled by another member of the same Clan, though usually not a direct family member.

List of City-states
Economy - Currency

Copper, when used for trade, is called "Rhok".
Bronze, when used for trade, is called "Koile".
Tin, when used for trade, is called "Tavi".
Silver, when used for trade, is called "Li-tavi".
Gold, when used for trade, is called "Druve".

Culture

In the Empire of Atar Khos, there are different kinds of greetings depending on one's social class, gender, and context.