Gregory repaired the Aqua Traiana, which had been damaged during the pontificate of Leo III. Sometime after 841 Gregory rebuilt and fortified parts of the port of Ostia against the attacks of Saracens, renaming it "Gregoriopolis". Around the same time he restored the colony of Galeria along the Via Portuensis, while also establishing a new colony, called Draco, along the left bank of the Tiber River, some eleven miles from Rome along the Via Ostiensis. This was the first clear example of land development undertaken by a pope within his own territory.