As a teenager he moved to England, where he was educated and adopted English and American constitutionalist doctrines, in addition to acquiring administrative experience as a British government official.

Upon returning to the country in 1846, he stood out as one of the most enlightened Cibaeño intellectuals and focused his attention on the technical and administrative reform of the State.

He was one of the main drafters of the Manifesto of the Revolution of 1857 waged by the liberals of Cibao against Buenaventura Báez, whose victory determined the transfer of the capital of the Republic from Santo Domingo to Santiago.

General Gregorio Luperón once said about Benigno de Rojas: He was a profound lawyer, a publicist with brilliant forms of daring ideas, who captivated with the beauty of his style and convinced with the truth of his arguments.

He always saw with a clear eye the difficulties that entrenched habits oppose to the reforms of progress, just as a good general sees the battlefield and dominates it.