 Complete the following phrase:  In 1338 Catherine crossed to the Peloponnese to attend to her interests there, bringing Nikephoros with her. At Catherines instigation the Epirotes rebelled in Arta on behalf of Nikephoros in late 1338: the rebels seized Arta and the Byzantine governor, Theodore Synadenos, and Nikephoros was crossed over into Epirus. However, Andronikos III and John Kantakouzenos swiftly subdued the rebellion and besieged Nikephoros in Thomokastron. Assuring his personal safety, John Kantakouzenos persuaded the garrison to surrender. Nikephoros was duly married to Maria Kantakouzene and was honored with the title of panhypersebastos. Taken to Constantinople, Nikephoros remained attached to the household of Kantakouzenos during the 