The city of Collippo, a small Roman municipium referred to by Plinius, is located south of Leiria. It is within the boundaries of the current municipality and with most of its occupation area inside the municipality of Batalha, was initially a Turduli settlement. During the Roman occupation, this urban settlement was the administrative centre of a wide territory in which a net of rural Roman villae and other villages were comprised, including the one that was set on the hill of the current Leiria Castle. On Leiria castle hill several structures dating back to the Roman age were found which prove that the native settlement here located was Romanised. There are even remains of painted plaster that indicate the existence of an important building, and traces found on the right bank of the river Lis, at Martim Gil, allow us to assume the existence of a thriving settlement related with farming activity. At this site an early-Christian mosaic with reference to Orpheus and his legend was found, reinforcing the importance of the existence of a settlement during this period and of the cultural expression of the Pax Romana.