 Alexander was greatly impressed by his adversary and not only reinstated him as a satrap of his own kingdom but also granted him dominion over lands to the south-east extending until the Hyphasis (Beas).After Alexander's death in 323 BCE, Perdiccas became the regent of his empire, and after Perdiccas's murder in 321 BCE, Antipater became the new regent.According to Diodorus, Antipater recognized Porus's authority over the territories along the Indus River.