[2] Despite being an employee at the service of the viceregal government, he did not hesitate to join the cause of Independence and signed the declaration act that the people of Lima approved in an open town hall on July 15, 1821.

In 1827 he was appointed prefect of Lima, a position he resigned when the coup d'état that deposed President José de La Mar (1829) took place.

Once the dictatorship of Lieutenant Colonel Felipe Santiago Salaverry was established, he served it as Minister of Government and Foreign Relations, from May 20 to June 24, 1835.

And although he was again appointed to occupy said portfolio on July 29, 1839, he had to leave it promptly because he was elected deputy to represent Lima in the General Constituent Congress meeting in Huancayo (from August 15 to November 28, 1839).

One of his great achievements was the signing with the representative of Brazil in Lima Mr. Duarte Da Ponte Ribeyro, of a "peace, friendship, trade and navigation treaty".

Likewise, he was a member of the Junta designated to agree on the Continental Treaty, whose purpose was to organize a joint front of the South American nations in the face of the interventionist threat of the European powers.

José Toribio Polo included his poetry in Parnaso Peruano (1916); but other critics such as Luis Alberto Sánchez did not give relevance to his poetic creation.

Ferreyros also produced a prose translation of Lord Byron's Childe Harold, which was published posthumously in the Revista de Lima (1873).

Two of his children stood out: Another lesser-known son of his was Eusebio Demetrio Ferreyros Senra (1847–1868), also a sailor, who died during the Arica tsunami of 1868, when the corvette América [es] on which he served ran aground.