Antigonus I Monophthalmus
Ptolemaeus () or Ptolemy (died 309 BC) was a nephew and general of Antigonus I Monophthalmus, one of the Successors of Alexander the Great. His father was also called Ptolemy and was a brother of Antigonus. Ptolemy, the nephew, was Antigonus's right-hand-man until his son Demetrius took on a more prominent role.