Answer
No, Antigonus I ultimately failed to maintain control over Phrygia. After successfully capturing Phrygia, he faced formidable challenges, including conflicts with rival Successor generals, strained relations with his son Demetrius I, and the rise of Lysimachus, a powerful opponent who eventually defeated him in battle. As a result, Antigonus lost control of Phrygia and other territories, leading to the further fragmentation of Alexander the Great's empire.