Together with Andrés Bonifacio and Emilio Jacinto, they formed the secret chamber of the society called Camara Reina or Kamara Negra.

[3] When the Katipunan was discovered, he fled to Balintawak (now part of Quezon City) on August 20, 1896, but he later availed of an amnesty that the Spanish colonial government offered, and he surrendered on September 1, 1896.

While still in prison, Valenzuela was elected the municipal president in his hometown Polo which forced the Americans to release him.

Valenzuela claimed in his memoirs that he was supposed to be the editor of the publication but Emilio Jacinto would eventually be the one to supervise its printing.

Kalayaan's first number, dated January 18, 1896, came out in March 1896 and consisted of a thousand copies which was distributed to Katipunan members all over the country.

He considered the publication of Kalayaan as the most important accomplishment of the secret chamber of the Katipunan, which he claimed consisted of himself, Bonifacio and Jacinto, and he leaves.

In a meeting of the secret chamber in July 1896, they decided to assassinate the Spanish Augustinian friar who uncovered the Katipunan to the authorities, but they failed to accomplish the mission.

At the secret general meeting called by Bonifacio on the night of May 1, 1896, at Barrio Ugong in Pasig, Manila province, Valenzuela presented to the body a proposal to solicit contributions to buy arms and munitions from Japan.

However, Rizal told him that the revolution should not be started until sufficient arms had been secured and the support of the wealthy Filipinos had been won over.

When the Katipunan was discovered, he fled to Balintawak on August 20, 1896, but he later availed of an amnesty that the Spanish colonial government offered, and he surrendered on September 1, 1896.

In Manila, he was denounced to the American Military authorities as a radical propagandist and once more imprisoned up to September of the same year.

He was portrayed by the following actors in these films: He was also portrayed by the following actors in the theater production Nom de Plume: Madlang Away[13] of the Valenzuela City Center for the Performing Arts: Directed by Andre Tiangco, Music by Arnel de Pano and Jose Jeffrey Camañag, with Roeder Camañag as the Artistic Director.