Constantine Leichoudes was an influential Byzantine prelate who served as the Ecumenical Patriarch of Constantinople between 1059 and 1063. Born in Constantinople, he studied alongside prominent figures like Michael Psellus and John Xiphilinus. Before his elevation to the patriarchate, he held significant imperial positions, including serving as a protovestiarios and as a president of the Byzantine Senate. He also functioned as the abbot of the Mangana Monastery while acting as a senior advisor to emperors Michael V and Constantine IX.