Marble head of Mithras found 1954 at site of 3rd century temple in Walbrook devoted to the Gods worship The last state pagan religion in Europe was Mithraism. The worship of Mithras, the Invincible Sun god was practised all over the Roman Empire, including the British Isles. The Temples in London and along Hadrian Wall can still be seen today as well some remains in Wales and York. There is no written formal documentation of the Western style of Mithraic Mysteries, the Roman 'Cult of Mithras'. The underground Temples and their paintings, statues and few anti-pagan documents by early Christian are all that remain.