 When the original Diocese of Lipa was created in April 10, 1910, the Bishop of Lipa had authority over a very vast region of a mostly homogenous Tagalog population.The Bishop used to oversee the Roman Catholics in the provinces of Batangas, Laguna, Quezon, Marinduque and Mindoro.In 1936, the first territorial re-organisation of the Roman Catholic Archdiocese of Lipa was promulgated with the creation of the Apostolic Prelature of Calapan, thus separating the province of Mindoro from the Archdiocese.