Paombong was originally one of the visitas (barrio) of Malolos mentioned in Capitulo XXXVI of Conquistas de Las Islas libro segundo by Fray Gaspar San Agustin. In a meeting held in Tondo Convent, the Provincial Chapter created the Town of Malolos in June 1580 with Fray Matheo de Mendoza OSA as its first minister, together with Barrios of Mambog under the patronage of San Roque,Matimbo with Santa Cruz and Paombong with Saint James Apostle. In 1619 Augustinians already established Paombong Convent but the town was administered by the justice of friars from Malolos. Paombong is not wealthy as its neighbor towns of Malolos and Hagonoy at time and it did not sustain its township and it was degraded again as barrio and being a visita in 1638.