The Old Empire reigned over Musatei and the Shadowlands. The Duat, being inhospitable to their race, was not settled. Their capital city, Exekias, was located near the river Antoi and included Castle Vallon, which at the time was the emperor's palace.
Each emperor ruled for an era, the approximate equivalent of 480 human years. At the end of every era, an order of princes, one from each city, would come together to decide which of them would be the next emperor. The princes held their titles for life; if one was killed, another was chosen out of the people of their city by the current emperor.
There was only ever one female emperor, Skoga, who came to power during a time of great turmoil. She reigned only briefly before she was assassinated.
Due to the destruction of most imperial buildings, including libraries, schools, and temples, very little of the Empire's culture and architecture remains intact. The most notable surviving construct is the emperor's palace. After Erasmus razed Exekias, he took up residence in the palace, which he re-dubbed Castle Vallon. The palace was decorated with ancient Exekian artworks featuring pagan gods; Erasmus' son Cassius ordered that these be destroyed. Nearby was an underground necropolis, where all of the Exekian emperors were buried; the tombs were robbed and the bodies were burned.