The archdiocese covers the entire province of Capiz on the island of Panay in the Visayas, central Philippines, and has its see in Roxas City.

This document, apart from encouraging the gradual transition of ecclesiastical leadership to the Filipino secular clergy, also proposed the formation of new dioceses in Lipa, Zamboanga, Tuguegarao, and Capiz.

[6] Decades after the Quae Mari Sinico, the Diocese of Capiz was eventually formed on 27 January 1951 by virtue of the Apostolic Constitution Ex supremi apostolatus.

The new diocese was carved from the territory of the Archdiocese of Jaro, and covered the whole civil provinces of Capiz (which included Aklan until 1956) and Romblon.

[8][9] On 17 January 1976, Pope Paul VI elevated the bishopric to the rank of an archdiocese through his Papal Bull Nimium Patens which turned it into an ecclesiastical province.