Divide and Conquer is a storyline quest part of Conquest: Asia Minor to conquer most of the territories. This quest is started after the successfull siege of Mytilene and the resulting full conquest of Lesbos.
Meeting with Theophilus
The first goal of this quest is to meet with the local ruler(s) of Asia Minor. This can be done in the Temple of Apollon, where you can meet Theophilus, the ruler of Mysia and high priest of the temple. The ruler, having a bad impression of the Romans and a good ally of Mithridates VI Eupator, refuses to switch sides and continues to insult the Legate, thus the meeting with him doomed from the start.
Despite the meeting with Theophilus being a failure, you will meet with Zenophia, who can be found on the lower levers of the temple. As the wife of the former rule of Mysia, who was murdered in his time of office and replaced by Theophilus, she still has quite some influence and could replace Theophilus, along with being to switch sides in the conflict.