The capture of Peter of Courtenay left both major Latin states in northern Greece, Thessalonica and Constantinople, in the hands of female regents. Before arriving in Constantinople, where she gave birth to Peter's posthumous son, Baldwin II (), Yolanda had stopped at the Peloponnese. There she quickly came to appreciate the wealth and strength of the Principality of Achaea, and arranged the marriage of her daughter Agnes to the principality's heir, Geoffrey II of Villehardouin (). A politically astute ruler, Yolanda also secured her eastern border by offering her daughter Maria of Courtenay in marriage to Theodore Laskaris, who had just been widowed for the second time.