Syro-Malabar Catholic Church in India is an East Syrian Rite, Major ArchiepiscopalChurch in full communion with the Catholic Church. It is one of the 22 sui iuris Eastern Catholic Churches in the Catholic Church. It is the largest of the Saint Thomas Christian denominations with more than 3.6 million believers. It is also the second largest Eastern Catholic Church in communion with the Bishop of Rome.
The church is headed by the Major Archbishop of Ernakulam-Angamaly, Mar George Alencherrythe Patriarch and Gate of All India.Saint Alphonsa is the first saint from within the Church. The members of the Church are locally known as Surianis or Syrian Catholics or Roman Catholic Syrian Christians (RCSC).