Seleucus I was a prominent general and one of the successors of Alexander the Great. After Alexander's death in 323 BCE, Seleucus established the Seleucid Empire, which stretched from the eastern Mediterranean to parts of India. He played a crucial role in the Hellenistic period, promoting Greek culture and governance in the regions he controlled. Born around 358 BCE, Seleucus initially served under Alexander and later became a key figure in the Wars of the Diadochi, the struggles for power among Alexander's former generals. He founded several cities, including Antioch, which became a major cultural and political center in the ancient world.