He was an expert on Galician history, especially history of A Coruña, and became a first mate in the merchant navy.
He made some research works on Caaveiro Monastery, tailors in Betanzos (A Coruña), Galician mints, coat of arms of A Coruña, etc. Diccionario Gallego de Autoridades was one of his most important works. He could only reach the letter C and used all the documentation of the Galician Academy on linguistic matters.
He was nominated as archivist and librarian of the Galician Academy in 1907 and was a member of several Spanish and Portuguese historical societies and academies (Academy of History and Association of Portuguese Archaeologists). In 1934, he became the official chronicler of A Coruña.