This ruler lends his name to a city that stood opposite from Ctesiphon on the (*) Tigris river, which he founded along with the city of Antioch.
Among the three members of the somatophylakes who conspired to murder of Perdiccas, this person was the only one to become royalty. The construction of a city named for this ruler led to the depopulation of the nearby cities of Opis and Sippar. This ethnically Greek ruler's armies provided the scythed chariots and elephants for the allied coalition during a battle against Demetrios Poliorketes and his father. This ruler lends his name to a city that stood opposite from Ctesiphon on the (*) Tigris river, which he founded along with the city of Antioch. This ruler, whose epithet means "the Victorious," was killed by Ptolemy Keraunos after allying with the Ptolemaic dynasty against Lysimachus. The largest contributor to the winning side at Ipsus, this former bodyguard of Alexander founded an empire that stretched from Caria to Baktria. For 10 points, name this diadochos who founded an empire that encompassed Syria and Persia.
Among the three members of the somatophylakes who conspired to murder of Perdiccas, this person was the only one to become royalty.
Seleucus Nicator [or Seleucus I; or Seleukos Nikator; accept Seleukeia] 