Michael Palaiologos
From this seclusion he was called by the Byzantine Emperor Theodore II Lascaris to the position of patriarch at Nicaea in 1255. Upon the emperor's death Arsenios may have shared guardianship of his son John IV Lascaris with George Muzalon: while the later historians Nikephoros Gregoras and Makarios Melissenos say the Patriarch was so named, the contemporary historians Pachymeres and Acropolites name only Mouzalon. Nevertheless, a few days after Theodore's death George Muzalon was murdered by Michael Palaiologos, and who, at an assembly of the aristocracy presided over by Patriarch Arsenios, was appointed regent for the boy. Arsenios also performed the double coronation of Michael Palaiologos and John Lascaris in January 1259.