Ptolemy XI Alexander II was a member of the Ptolemaic dynasty who ruled Egypt for a few days in 80 BC.

Ptolemy IX Lathryos died in 81 or 80, leaving no legitimate heir, and so Cleopatra Bernice ruled alone for a time. However, Rome's Sulla wanted a pro-Roman ruler on the throne, and sent the young son of Ptolemy X Alexander to Egypt, displaying Ptolemy Alexander's will in Rome as justification for this obvious intervention.

The will also required Ptolemy XI to marry Cleopatra Berenice, who was his stepmother (or possibly his natural mother - the ancient sources are unclear). However, nineteen days after the marriage, Ptolemy murdered his bride for unknown reasons, an unwise move since Berenice was very popular; Ptolemy was immediately lynched by the citizens of Alexandria.

He was succeeded by Ptolemy XII.

Reference

• Peter Green, Alexander to Actium (University of California Press, 1990), pp. 553-554 ISBN 0-520-05611-6