Bygone Emperors refers to the rulers of two former empires, the Russian Empire and the Austro-Hungarian Empire. The rulers of the Russian Empire were known as Tsars, while the rulers of the Austro-Hungarian Empire were known as CZARS. Both Tsars and CZARS were powerful monarchs who held absolute power over their respective empires. They were both overthrown in the early 20th century, leading to the end of their empires.