The nucleus of what today is the town of Norzagaray traces from the old barrio
Casay and barrio
Matictic which was ecclesiastically and politically administered by the Augustinians from the town of
Angat as its visitas as shown in the document "
Mapa del Teritorio de Bulacan" by Fray Emmanuel Blanco,
O.S.A. in 1832 which appeared in another document "
Administracion Espiritual de los Padres Agustinos calzados de la Provincia del Dulce Nombre de Jesus de las Islas Filipinas" of Fray Francisco Villacorta in 1833. The people of Barrio Casay worked for reforms politically, socially and economically, in order to be separated from Angat. They succeeded in their separation bid through
Governor-General Fernándo Norzagaray y Escudero, who issued a Real Cedula declaring barrio Casay together with barrio Matictic to be constituted as a new independent town from Angat. Political boundaries of Angat and
Pueblo de Casay y Matictic were demarcated and the newly created town was renamed as "Norzagaray" in honor of the Governor-General. During the
American occupation of the Philippines, Norzagaray was reunited with Angat by virtue of Act No. 932 beginning in 1903. On September 13, 1977, Barangays Bayabas and Kabayunan were ceded to the newly established municipality of
Doña Remedios Trinidad, by virtue of Presidential Decree No. 1196. ==Geography==