During the earlier part of the 17th century, Tarangnan or Tinago was the first settlement of
Jesuit missionaries on the island of Samar. Tinago was the first
cabecera on Samar where the first Jesuits have arrived, that is October 15, 1596. When Tinago was devastated by the Moro attack in 1616, the Jesuits decided to transfer the
cabecera to
Catbalogan. Since that time Tinago had not came back to life as pueblo until 1725. The
poblacion was established at Dapdap but for access and sanitation it was moved to tarangnan in 1883–1884. The attempted transfer of the
pueblo from Dapdap to Tarangnan in 1882 became highly celebrated case. It was a struggle or a fight between the parish priest of Dapdap, fr. Angel Pulido, OFM and the
governadorcillo of
Dapdap. The town of Dapdap was transferred in 1884 to a barrio called Tarangnan, from which it derived its name today. At first the church and
convento were constructed of light materials which means bamboo and nipa. The new church was constructed in 1894 by P. Venancio Palencia, OFM and completed in 1897. In the second half of the nineteenth century, the island of Samar experienced a commercial boom, especially in
abaca, with imports and exports of abaca products. Moro raids in the island declined due to the presence of
Spaniards. As the Spaniards settled in Samar, they saw the need of all-weather seaports and easy communications for their commercial activities and political administration. This development paved the way for the convergence of the inhabitants into the old town site of Tarangnan, where transport was relatively accessible. The settlement of Tarangnan was growing at a much faster pace than the pueblo of Dapdap. Taking into consideration the island's commercial boom, with prospects of Tarangnan as a trading center and its religious vigilance over Dapdap, on June 21, 1881, Gov. Enrique Chacon wrote to his superiors. He recommended the transfer of the Poblacion from Dapdap to Tarangnan due to the former's poor accessibility, unavailability of land area for expansion, and its unsanitary environment. On April 1, 1884, Tarangnan was declared as one of the municipalities of the Province of Samar by means of Royal Decree by the King of Spain, King Alfonso I. In 1957, the following sitios were declared barrios: Cabunga-an, Tigdaranao, and Binalayan. In 1979, by virtue of
Batas Pambansa Blg. 16, nine
barangays were separated to create the municipality of
Pagsanghan. ==Geography==