The Hellenistic Kings were rulers who emerged after the death of Alexander the Great in 323 BCE, during a period known as the Hellenistic Era. This era saw the division of Alexander's vast empire among his generals, known as the Diadochi, who established their own kingdoms across Greece, Egypt, and parts of Asia. These kings often adopted Greek culture and promoted the spread of Hellenism. The most notable Hellenistic kingdoms included the Ptolemaic Kingdom in Egypt, founded by Ptolemy I, and the Seleucid Empire, established by Seleucus I. These rulers were known for their patronage of the arts, sciences, and philosophy, contributing to advancements in various fields and the blending of cultures across their realms.