Ostasio II da Polenta

Ostasio II da Polenta (died 1396) was an Italian condottiero and lord of Ravenna.

Biography
Ostasio was the son of Guido III da Polenta, lord of Ravenna.

He served under the Angevines in 1382. Four years later, he fought at the orders of his brother-in-law, Antonio della Scala, lord of Verona, against Francesco da Carrara of Padua. In 1387, he led a corps of 1,500 knights and, along with Giovanni Ordelaffi, he faced the White Company led by John Hawkwood, who had been hired by the Paduans. He was defeated at the Battle of Castagnaro by Hawkwood.

In 1389 (the year in which he had his father imprisoned), he was made papal vicar of Ravenna, a position he held until his death in 1396, reigning together with Obizzo da Polenta and his other brothers.