Errázuriz was born in Santiago, the son of Francisco Javier de Errázuriz y Madariaga and of María Rosa Aldunate y Guerrero Carrera. He became a lawyer and participated in the independence movement in Chile. On 2 October 1801 he married María del Carmen Sotomayor Elzo, with whom he had 8 children.
Chilean independence process (1810–1823)
In the First Government Junta (open council 1810 ), he was governor of the open council of 1810.[2]
During the period of the Patria Vieja, he was elected deputy for Rancagua in the First National Congress of 1811.
War of Independence of Chile
He participated in the War of Independence and suffered persecution during the Spanish conquest between 1814 and 1817. He regained his freedom after the patriot victory at Chacabuco on 12 February 1817.[3]
During the period of Patria Nueva, from 12 February 1817 until 28 January 1823, he was deputy for Rancagua.
On the morning of 28 January 1823 an open council meeting was convened to ask for the abdication of the Supreme Director Bernardo O'Higgins. The Government Junta was formed by Agustín de Eyzaguirre, Errázuriz and José Miguel Infante.
On 12 December 1823 he was elected president of the Congress, which began to be bicameral.
Provisional President of Chile: He served as president of the Provincial Assembly of the Santiago in 19 October 1826 and 26 November 1827. He was appointed interim president of the congress of plenipotentiaries in March 1830.[citation needed]
Provisional President of Chile: On 8 March 1831, due to the resignation and subsequent death of José Tomás Ovalle was appointed accidental vice president or provisional president until 22 March. That day, he took the office, which was maintained until 18 September that year. Then he was succeeded by José Joaquín Prieto, who had been elected in the convened presidential vote.