Obizzo II d'Este

Obizzo II d'Este (c. 1247–1293) was the illegitimate son of Rinaldo d'Este and grandson of Marquis Azzo VII. Banished with his mother, he grew up at Ravenna, and after his father died a hostage in Apulia, Azzo VII fought to have him recognized as his heir. Pope Innocent IV legitimated him in 1252.

In 1264 the Ferrarese proclaimed him their lifelong lord; he added Modena in 1288 and Reggio in 1289, founding the Este signoria over Ferrara. Dante places him in the Seventh Circle of Hell; he was probably murdered in February 1293, reputedly by his son Azzo VIII.