Mallari was from San Nicolas, Pampanga (present-day
Macabebe, Pampanga). He studied
theology at the
University of Santo Tomas and completed his studies in 1809, after which he was ordained and became the
coadjutor in
Gapan,
Lubao, and
Bacolor. He then vied for the position of parish priest in several areas, namely
Orani,
Mariveles, Lubao and in the
Port of Cavite as a chaplain, but was consistently rejected. During this period, Mallari also pursued calligraphy, earning him the recognition of being the second Filipino calligraphic artist-priest, after Fr. Mariano Hipolito. As a parish priest, he was known for decorating annual reports with flowers, vines and angels on clouds. ==Murders==