great cities in the Western Empire, was a centre for the dissemination of Christianity. Its first attested Bishop was St. Potamius (c. 356), and there were several martyrs killed during persecutions, such as the Diocletianic Persecution; Verissimus, Maxima, and Julia are the most significant names. According to legend the three were sons of a Roman senator, martyred in Lisbon in the 4th century, under the Roman governor Ageian or Tarquinius in the time of Emperor Diocletian. A temple was then built in the Campolide area, whose ruins still existed in the Middle Ages . The relics of the saints are kept in the Santos-o-Velho Church. In the middle of the 4th century the Olisipo diocesis was formed. There is also the legend of Saint Ginés (São Gens), presented as one of the first martyr bishops of Lisbon and remembered in the Nossa Senhora do Monte chapel. At the end of Roman rule, Olisipo was one of the first Christian cities. Roman architectural remains in the region The city was a caput viarium of the Roman road to Bracara Augusta and the three roads to Emerita Augusta. Olisipo controlled a vast region, bordered by the Alcabrichel and Ota rivers in the north. The territory includes the following Roman archaeological finds, known settlements or place names: In the current Sintra municipality Archaeological Site of Alto da Vigia (Praia das Maçãs, Sintra) Archaeological Site of Colaride (Alto de Colaride, Sintra) Archaeological Museum of São Miguel de Odrinhas (Odrinhas, Sintra) Roman dam of Belas (Belas, Sintra) Roman bridge at Catribana (Catribana, Sintra) Roman bridge at Albarraque (Rio de Mouro, Sintra) Roman bridge at Várzea de Baixo (Colares (Sintra)) Roman bridge at Cheleiros (Cheleiros, Sintra) Roman villa of Santo André de Almoçageme (Almoçageme, Sintra) Roman villa of Amoreira (São João das Lampas, Sintra) Roman villa of Barros do Casal Silvério (Montelavar, Sintra) Roman villa of Granja dos Serrões (Pêro Pinheiro, Sintra) Roman villa of Corrais do Chão (Sintra) Roman villa of São Marcos (São Marcos, Sintra) Roman site of Vila Velha (Sintra) Vicus of Faião (Terrugem, possible location for Chretina) Roman mine of Monte Suimo (Serra da Carregueira, Sintra) Fountain of Armés (Terrugem, Sintra) Roman villa of Lugar do Mercador (Mucifal, Sintra) Promontorium Lunae (Cabo da Roca, Sintra) Mons Lunae (Serra de Sintra) In the current Cascais municipality Roman villa of Alto da Cidreira (Alto da Cidreira, Cascais) Roman villa of Vilares (Murches, Cascais) Roman