Answer
The answer to the question is Cyrenaica. Cyrenaica is a region in eastern Libya that was ruled by the Ptolemaic dynasty of Egypt. Berenice II was the daughter of the king of Cyrenaica, Magas, and the reigning queen of the region when Ptolemy III married her. The marriage between Ptolemy III and Berenice II was a political alliance that was designed to strengthen the Ptolemaic dynasty's control over Cyrenaica.