Pope Leo X, a Medici, proposed to finish the project, but was opposed by the Duke of Sermoneta over the fishing rights. In 1514, he decided to drain the region around Terracina instead, assigning the task to his brother Giuliano de Medici, commander of the papal army. The Medicis would retain all reclaimed land. In 1515, Giuliano hired Leonardo da Vinci to design the project. It provided the Ufente River with outlets through the Canale Giuliano and Canale Portatore. Giuliano died in 1516, and the city of Tarracina combined with Sermoneta and Sezze to halt work, over the issue of property rights. The people of the marsh were not going to allow the Medicis to take their land.