Born in Tondo, Manila, Emilio Jacinto was proficient both in Spanish and Tagalog. He attended San Juan de Letran College, and later transferred to the University of Santo Tomas to study law. Manuel Quezon, Sergio Osmeña and Juan Sumulong were classmates. He did not finish college and, at the age of 19, joined the secret society called Katipunan. He became the advisor on fiscal matters and secretary to Andrés Bonifacio. He was later known as Utak ng Katipunan (transl. Brain of Katipunan). He and Bonifacio also befriended Apolinario Mabini when they attempted to continue José Rizal’s La Liga Filipina.

Jacinto also wrote for the Katipunan newspaper called Kalayaan. He wrote in the newspaper under the pen name “Dimasilaw”, and used the alias “Pingkian” in the Katipunan. Jacinto was the author of the Kartilya ng Katipunan as well.

After Bonifacio’s execution, Jacinto pressed on with the Katipunan’s struggle. Like general Mariano Álvarez, he refused to join the forces of General Emilio Aguinaldo, the leader of the Katipunan’s Magdalo faction. Jacinto lived in Laguna and also joined the militia fighting the Spaniards. Jacinto contracted malaria and died on April 16, 1899, in Brgy. Alipit, Santa Cruz, Laguna.[1] His remains were initially buried in Brgy. San Juan, Santa Cruz, Laguna, and were transferred to the Manila North Cemetery a few years later and then transferred his remains at Himlayang Pilipino Memorial Park in Quezon City.

He was married to Catalina de Jesús, who was pregnant at the time of his death.