Nicholas I Sanudo

Nicholas I Sanudo (c. 1295–1341), son of William I, became fifth duke of the Archipelago in 1323. In 1311 he fought at Halmyros beside his brother-in-law Walter V of Brienne, duke of Athens, and was one of the few knights on the losing side to escape with life and freedom.

As a vassal of Achaea he joined John of Gravina's 1325 campaign in the Morea and fought at the futile siege of Karytaina. When John left in spring 1326, Nicholas took charge and beat a larger Byzantine army before leaving the Morea.

He married Joanna of Brienne. On his death his brother John I succeeded him, while another brother, Marco, was lord of Milos.