Siya ay isang mamamahayag, manunulat, manananggol at pinuno ng mga manggagawa. Siya ang nagtatag ng Iglesia Filipina Independiente.
Ang ilan pa sa kanyang mga naisulat ay Las Islas Bisayas en la Epoca de la Conquista, Historia de Ilocos , La Il Sensacional Memoria Sobre La Revolucion Filipina,Ang Singsing ng Dalagang Marmol at iba pa.
Anak siya ni Elias delos Reyes at ni Leona Florentino, ang unang makatang babae ng Ilocos Sur.
Isabelo de los Reyes, Sr. July 7, 1864, Vigan, Ilocos SurIsabelo de los Reyes was born on July 7, 1864 in Vigan, Ilocos Sur to Elias de los Reyes and Leona Florentino, a well known poetess of the Philippines.
At the age six, the young Beluce (his nickname then) was committed by his father to the care of a rich relative, Don Mena Crisologo.
As a boy, he studied at the Vigan Seminary, where he began to hate the friars because of their maltreatment of the students that led them to strike. In June 1880, at 16, he went to Manila and enrolled as a self-supporting student at the San Juan de Letran College where he obtained the grades of sobresaliente in all subjects when he graduated with the Bachelor of Arts Degree. He later studied law in the University of Santo Tomas, and registered for courses in paleography, history and anthropology. He was flexing the universality of his interests.
He became a notary at the age of 22. As the legal age to practice law was 25, he turned his attention towards journalism.
His first article dealt with the “Invasion of Limahong”, which appeared in the Diario de Manila in November 1882. Then he founded the first vernacular paper, El Ilocano. He published the prize winning books, the Historia de Ilocos, Folklore Filipino and also Las Islas Visayas en la epoca de la Conquista: He edited