On April 30, 1578, Bulakan town was officially established by the Augustinians with Fray Diego Vivar as its first prior and the convent was dedicated to San Agustin. (when it was changed to Our Lady of Assumption was uncertain). It was reported that the western part of the present-day Bulacan was to be very well populated and rich. No exact date and year when Alcaldia de Calumpit was dissolved and the exact foundation year of the Province of Bulacan. It was only documented that Malolos (then part of Calumpit in 1572) was first to appear as part of Alcaldia de Bulacan was in 1582. It may be assumed that the reorganization of encomiendas has occurred between 1580-1582 at the time of Governor-General Gonzalo Ronquillo de Penalosa.