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In 1335 his troops conquered Reggio Emilia, which he would abandon only in 1371. Here he built a citadel, destroyed in 1850. In 1345 he was unsuccessfully besieged by Mastino I della Scala. In 1363, leading an anti-Visconti coalition, he won a battle at Solara. He signed a treaty of peace with Bernabò Visconti in 1364, and in 1366 he was appointed as imperial vicar in Reggio by emperor Charles IV. In 1370 and again 1371 the Visconti besieged him in Reggio, and Feltrino was forced to sell Reggio to Barnabò Visconti for 50,000 golden florins.
However, he maintained the county of Novellara and Bagnolo, which was ruled by a Gonzaga cadet branch until 1728.
He died in Padua in 1374.
- Guido (+1399), lord of Novellara. He married Ginevra Malatesta, daughter of Malatesta III lord of Rimini. Their son was Giacomo (+1441) lord of Novellara
- Guglielmo (+ after 1356); his descendants were conti di Thiene.