John of Montecorvino.
Historically Catholicism in Malabar had its origin in 1291 AD, when John of MonteCarvino staying in Kollam (Quilon) baptised a large number of people to the catholic faith.Fr. John of Monte Carvino was the first Catholic priest known to have reached Kerala. In1324, a Dominican father Jordanus came to India by trade route. Starting from Kochi heworked along the coast and reached Kollam, converting a large number of people to Catholic faith. When Fr. Jordanus Catalani left for Rome in 1328, the number of Catholics inKerala was more than 10,000. Kollam (Quilon) was the first centre of proselytisation by Rome and also the first diocese in India.
On the request of Jordanus five Dominican fathers responded to propaganda work at Kollam. They continued Catholic propaganda and bapitsm. All those christianswere in obeisance to Rome and Latin was their ritual language.Fr. Jordanus was consecrated as Bishop of Kollam by Pope John XXII on 9.8.1329
.But Bishop Jordanus was miserably stoned to death at Thana (Mumbai c. 1336). After thedeath of Jordanus, the Catholics of Kollam mission turned to be flocks without shepherd.Consequently they also became St. Thomas Christians . Whether converted by St. Thomas, or Mar Saporor Proth or Thomas of Cana or John of Monte Carvino or Jordanus, all christians in Malabar were non catholic christians when the Portuguese came in the 15th Century.