San Sebastian Cathedral Parish, commonly known as Tarlac Cathedral, is a post-war, Neo-Gothic Roman Catholic church located in Brgy. Mabini, Tarlac City, Philippines. The cathedral, which was dedicated to Saint Sebastian in 1686, is the seat of the Diocese of Tarlac. A historical marker of the National Historical Commission of the Philippines was unveileā¦San Sebastian Cathedral Parish, commonly known as Tarlac Cathedral, is a post-war, Neo-Gothic Roman Catholic church located in Brgy. Mabini, Tarlac City, Philippines. The cathedral, which was dedicated to Saint Sebastian in 1686, is the seat of the Diocese of Tarlac. A historical marker of the National Historical Commission of the Philippines was unveiled near the cathedral's entrance on July 15, 2022.