Calbayog as a town and parish during the Spanish period was composed of several villages, the most populated of which are called visitas. Calbayog grew from visita size and became a pueblo (town). It was created a separate parish in 1785. Separated from the ecclesiastical jurisdiction of the parish priest of Capul, it was later given its own minister, becoming a religious center. Its parish priests cared for the spiritual needs of the people living in what are now Calbayog City, the municipalities of Santa Margarita, Santo Niño and Almagro. By the late 19th century a number of visitas became the poblaciones when new towns were created from Calbayog. They were Caybago (later called Oquendo), Santa Margarita, Weyler (later called Tinambacan) and Santo Niño.