Philip II united the Greek city-states of Macedonia and expanded its territory. His son, Alexander the Great, further expanded the empire by conquering Persia and parts of India. After Alexander's death, his generals divided the empire among themselves, establishing ruling dynasties like the Ptolemies in Egypt and the Seleucids in Asia. This period saw the growth of Hellenistic culture as Greek ideas spread. Philosophies like Stoicism and Epicureanism developed, and science and scholarship flourished in cities like Alexandria.