José Tadeo Mancheño y Laso de la Vega (ca.
He was trained as a lawyer at the Universidad de San Felipe, where he graduated on October 29, 1810.
In the Patria Vieja period, he was Secretary of Foreign Affairs between October 9, 1813 until March 9, 1814, nominated by the junta headed by José Miguel Infante.
After the Spanish Reconquista, he served as juridical assessor and secretary of the Cabildo (City hall) of Santiago, a position he retained after the Battle of Chacabuco and the collapse of the Colonial government.
Elected Senador (1852–1861), he took his position on June 7, 1852; died before the end of his term at the age of 71.