Constantine XI Palaiologos
In 1424, Notaras was one of three emissaries—along with Manuel Melachrenos and George Sphrantzes—who negotiated a treaty of friendship between Emperor John VII Palaiologos and Sultan Murad II of the Ottoman Turks at the end of the Ottoman Interregnum. His continued importance as an imperial official is attested by his presence at the marriage of the future Emperor Constantine XI Palaiologos to Caterina Gattilusio 27 July 1441.