Located in Kaduthuruthy, the present Kaduthuruthy St. Mary’s Valiapally is a third building serving the congregation, and is linked to the history of the Knanaya community known as Southists (തെക്കു൦ഭാഗർ) (Knanites(ക്നാനായക്കാര്)), who migrated to Kerala under the leadership of Kanai Thommen in AD 345 from East Syria to escape from the severe persecution of Persian emperor Shapor-II.