The Ptolemaic dynasty was a Macedonian royal family that ruled Ptolemaic Egypt from 323 to 30 BCE. It was founded by Ptolemy I, a general and successor of Alexander the Great. They built Alexandria, including the Lighthouse of Alexandria and the Great Library of Alexandria. The dynasty ended when Rome conquered Egypt in the reign of Cleopatra VII.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Ptolemaic_Dynasty/.