The Alexandrian astronomer-geographer Claudius Ptolemy (90–168 A.D.) compiled a list of successive kings of Babylon and Alexandria, presumably relying on earlier king lists. Ptolemy’s Canon begins with the reign of Nabonassar, ruler of Babylon. The chart below includes the first 44 kings on the list: the Babylonian, Assyrian and Persian rulers of Babylon; and the Ptolemaic rulers of Alexandria. The 44th king is the Roman emperor Augustus, who annexed Egypt in 30 B.C. and reigned until 14 A.D.