Saint Francis Xavier, a Spanish Jesuit missionary, landed in Goa in May 1542 and he sailed from Goa to Cape Comorin in October 1542 on missionary tour to Travancore Once a great band of dacoits attacked Travancore. Rajas forces couldt combat the enemy successfully, but Xavier chased away the marauders at Vadasery by raising his Crucifix aloft and shouting at them. Very pleased with Xavier, the Raja showed special regards and gratitudes to him.At Kottar, Xavier had a dwelling house and a small church. Tradition says that the heathens set fire to Xaviers house and reduced it to ashes, but they were struck with awe when they saw the holy man on his knees devoutly praying, not in the least touched by the flames. To mark the place a cross was put up, to which miraculous powers were attributed. From the time the church was built on the spot, a lamp is kept perpetually burning. Even Hindus go there and make vows and pour oil. Miracles are recorded to have taken place there; and hence multitudes of devout Catholic pilgrims from British India, Ceylon and Malacca  resort to the annual festival at St. Xaviers church, Kottar, about December of every year. Christianity in Travancore was introduced by the disciple of Jesus Christ St.Thomas in 52 AD.The primitive or original church which still subsists was built by St. Francis Xavier himself between the years AD 1542 and AD 1550.Afterwards the Bishops of Cochin constructed a new and more spacious church that was richly endowed with precious ornaments and utensils gifted by the Kings of Portugal.The mortal remains of Christian martyr Devasahayam Pillai were given a Christian burial in front of the high altar of St.Xaviers church at Kottar in January AD 1752.While being one of the oldest churches in the whole of erstwhile Southern Travancore, it is definitely the oldest Cathedral church of Roman Catholic Diocese of Kottar in the present-days Kanyakumari district (of Tamil Nadu) since there are three more dioceses got established here later on.