Seloukous, also known as Seleucus I Nicator, was a general under Alexander the great who became the founder of the Seleucid Empire following Alexander's death in 323 BCE. He established his rule over a vast territory that included parts of modern-day Turkey, Syria, and Iran. The Seleucid Empire was known for its cultural blending of Greek and Eastern influences and played a significant role in the Hellenistic period. Seleucus was also notable for his military prowess and administrative reforms.