Pietro Zeno (died 1427), was lord of Andros from 1384 until his death in 1427, and a distinguished diplomat in the service of the Republic of Venice.
[5] He played a role in the negotiations that saw the return of Argos to the Republic of Venice after its occupation by the Byzantine Despot of the Morea, Theodore I Palaiologos.
[7] Playing on Ottoman fears of a concerted Christian campaign against them in the aftermath of their disastrous defeat at Ankara, he managed to extract a number of concessions from Süleyman Çelebi in the Treaty of Gallipoli, concluded in January or early February 1403: Venice was granted a strip of territory on the Greek mainland opposite the whole length of the island of Euboea, which was a Venetian possession; the Northern Sporades were ceded to the Byzantines; the transfer of the County of Salona to the Knights Hospitaller was ratified; the tribute levied on the Marquisate of Bodonitsa was not raised; and finally the Sultan promised to restore Athens to Venice.
In the event, the latter promise remained a dead letter, and Venice was forced to recognize Acciaioli rule over Athens a few years later.
Andros managed to escape relatively unscathed, but in return Zeno was forced to pay tribute and provide harbour and shelter for the Turkish ships there.