Obizzo III d'Este

Obizzo III d'Este (14 July 1294 – 20 March 1352) ruled Ferrara for thirty-five years. A son of Aldobrandino II d'Este, he took power in 1317 jointly with his brothers and cousin, and ended as sole lord.

Modena's general council restored Este rule in 1336, and he bought Parma in 1344 but held it only two years. His marriage gave him no children; his heirs came from his long-time mistress Lippa Ariosti, known as la Bella.

She bore his successors Aldobrandino III and Niccolò II and several daughters. He married her in November 1347, shortly before her death, to legitimize them.