Between 1200 and 1425 the monastery of Gorgona, which belonged to the Order of Saint Benedict for much of that time and was in the territory of Pisa, acquired about 40 legal papers of various sorts related to Corsica. As the church was replacing Pisan prelates with Corsican ones there, the legal language shows a transition from entirely Latin through partially Latin and partially Corsican to entirely Corsican. The first known surviving document containing some Corsican is a bill of sale from Patrimonio dated to 1220. These documents were moved to Pisa before the monastery closed its doors and were published there. Research into earlier evidence of Corsican is ongoing.