Jose Maria Sison, allegedly the man behind the nom de guerre Amado Guerrero, confirmed its birth at Barangay Dulacac in the tri-boundary of Alaminos, Bani and Mabini in the province of Pangasinan.
A monument of Limahong can be seen at the wharf in Barangay Lucap in Alaminos, Pangasinan.
The diocese was erected in 1985 from the Archdiocese of Lingayen-Dagupan with the bishop's see at Alaminos, Pangasinan.
It is under the jurisdiction of the Roman Catholic Diocese of Urdaneta (from the Roman Catholic Archdiocese of Lingayen-Dagupan, Archdioecesis Lingayensis-Dagupanensis, created on May 19, 1928, elevated to Archdiocese on February 16, 1963, comprising the capital of the province, 2 cities and 15 municipalities in the central part of Pangasinan; Suffragans: Alaminos, Cabanatuan, San Fernando, La Union, San Jose, Nueva Ecija and Urdaneta; Titular: St. John the Apostle and Evangelist).