Cleopatra III & Alexander I
Cleopatra III & Alexander I were co-rulers of the Ptolemaic Dynasty after Cleopatra had driven out her older son, Ptolemy IX Soter II (Lathyros), after accusing him of trying to kill her.
Alexander had been the governor of Cyprus, but after Lathyros had been ousted, he returned to Alexandria to rule with his mother. Not long after he came to rule, his mother soon grew tired of him as well and forced him to flee from Alexandria. In 101, he returned under the pretense of a reconciliation with his mother. He came back and had her assassinated.
Alexander was finally driven out of Egypt after selling off Alexander the Great's gold coffin to raise money. He willed his kingdom to Rome however, they could not claim their inheritance while he was still alive. It did allow him to gain favor with moneylenders in Rome. This did allow him to finance a fleet. He was killed in a naval battle off Cyprus.