The prelature was erected by Pius XII on April 25, 1950 carving it from the Diocese of Lipa. Its territory included the islands of
Polillo and the northern part of the province of
Quezon. At this time, the province of
Aurora is a sub-province of Quezon. Upon the erection of the See of Infanta, Bishop
Rufino Jiao Santos (later Archbishop of Manila and a cardinal) was appointed Apostolic Administrator. A year later, on July 11, 1951, Rev. Fr. Patrick Harmon Shanley, OCD, Vicar Provincial of the
Order of Discalced Carmelites in the Philippine Islands, was appointed Apostolic Administrator of the Prelature of Infanta. ==Prelates=="On chief, red, a daisy. On a silver fess a blue lozenge with the gold fleur-de-lys of the Bourbon dynasty. At base a seascape with a coconut tree from a green knoll on the dexter side. "The daisy is the symbol of the innocence of the Holy Child, the new titular of the principal church of the prelature after it was rebuilt almost entirely. Its former patron saint was St. Mark the Evangelist, now the secondary patron saint of the prelature. "Infanta" was the official title of the Royal Princess of Spain. The lozenge-form of the Bourbon arms may have been used by the Infanta of Spain in whose honor the town (now the seat of the prelature) was named because the heraldic shield for ladies is lozenge-formed. The seascapewith the coconut tree on a knoll symbolizes the coconut-clad province which is the territory of the prelature."--> The Prelature of Infanta was first administered as a mission of the Order of Discalced Carmelites. Its apostolic administrators and bishops were members of the religious order until 2015. These include Bishop Patrick Shanley, OCD, Fr. Joseph Flanery, OCD, Bishop Julio Xavier Labayen, OCD, and Bishop Rolando Tirona, OCD. == Parishes ==