Battle of Ipsus
Antigonus I Monophthalmus , ruler of Phrygia , and his son Demetrius I of Macedon were pitted against the coalition of three other sucessors of Alexander: Cassander , ruler of Macedon; Lysimachus , ruler of Thrace; and Seleucus I Nicator , ruler of Babylonia and Persia . 
<triplet> Antigonus I Monophthalmus <subj> Demetrius I of Macedon <obj> child <triplet> Demetrius I of Macedon <subj> Antigonus I Monophthalmus <obj> father