Romagna is a historical region of northern Italy, corresponding to the south-eastern portion of the region of Emilia-Romagna. The region is home to the cities of Cesena, Faenza, Forli, Imola, Ravenna, Rimini, and the city-state of San Marino, and the region is home to the Romagnol language. The region was ceded to the Papal States by Rudolf I of Germany in 1278, but Papal control was for long nominal, with regional lords carving the region up. In 1500, the Papal general Cesare Borgia succeeded in conquering Romagna for the House of Borgia, carving out a duchy for himself; the duchy dissolved upon his death. The region briefly gained recognition as an entity under French rule at the time of the French Revolution, but it was returned to Papal control in 1815 as a result of the Congress of Vienna. In 1860, Romagna became a region of a united Italy.