Niccolò I d'Este

Nicolò I d'Este (1294 – 1 May 1344), a son of Aldobrandino II d'Este and Alda Rangoni, ruled Ferrara jointly with his brothers Rinaldo II and Obizzo III. In 1333 he defended the city against the papal legate Bertrando del Poggetto, was captured, and was freed by Rinaldo.

He joined the conquest of Modena in 1335 and in 1337 commanded the Este army against Mastino II della Scala of Verona. He married Beatrice Gonzaga, and their son Rinaldo was born in 1333.