the end of the 2nd century BC, the Pharnavazid king Pharnajom was dethroned by his own subjects and the crown given to the Armenian prince Artaxias who ascended the Iberian throne in 93 BC, establishing the Artaxiad dynasty of Iberia. Roman period and Roman/Parthian rivalry This close association with Armenia and Pontus brought upon the country an invasion (65 BC) by the Roman general Pompey, who was then at war with Mithradates VI of Pontus, and Armenia; but Rome did not establish her power permanently over Iberia. Twenty-nine years later, the Romans again marched (36 BC) on Iberia forcing King Pharnavaz II to join their campaign against Albania. While another Georgian kingdom of Colchis was administered as a Roman province, Iberia freely accepted the Roman Imperial protection. A stone inscription discovered at Mtskheta speaks of the 1st-century ruler Mihdrat I (AD 58–106) as "the friend of the Caesars" and the king "of the Roman-loving Iberians." Emperor Vespasian fortified the ancient Mtskheta site of Arzami for the Iberian kings in AD 75. The next two centuries saw a continuation of Roman influence over the area, but by the reign of King Pharsman II (116–132) Iberia had regained some of its former power. Relations between the Roman Emperor Hadrian and Pharsman II were strained, though Hadrian is said to have sought to appease Pharsman. However, it was only under Hadrian's successor Antoninus Pius that relations improved to the extent that Pharsman is said to have even visited Rome, where Dio Cassius reports that a statue was erected in his honor and that rights to sacrifice were given. The period brought a major change to the political status of Iberia with Rome recognizing them as an ally, rather than their former status as a subject state, a political situation which remained the same, even during the Empire's hostilities with the Parthians. From the first centuries of the Christian era, the cult of Mithras and Zoroastrianism were commonly practiced in Iberia. Excavation of rich burials in Bori, Armazi, and Zguderi has produced silver drinking cups with the impression of a horse either standing at a fire-altar or with its right foreleg raised above the altar. The cult of Mithras, distinguished by its syncretic character and thus complementary to local cults within Georgian mythology, especially the cult of the Sun, gradually came to merge with ancient Georgian beliefs. It is even thought that Mithras must