Ignacio Álvarez Thomas

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José Ignacio Álvarez Thomas (1787–1857) was a Peruvian-born Argentine military officer, diplomat and statesman. He served as interim Supreme Director of the United Provinces of the Río de la Plata from May 6, 1815, to April 16, 1816, during a transition after the fall of Carlos María de Alvear and before Antonio González de Balcarce.

Early life and career
He was born in Arequipa, Peru, to Spanish official Antonio Álvarez y Jiménez and María Isabel Thomás y Rancé. His family moved to Buenos Aires in 1797. He joined local forces around 1800, helped defend against the British invasions (1806–1807), and later joined the revolutionary movement after the May Revolution of 1810.

Becoming interim director
In April 1815, amid conflict with the Federal League, Álvarez Thomas led troops that refused to continue toward Santa Fe in an episode known as the Fontezuelas uprising, which helped precipitate the resignation of Director Alvear on April 15. The Assembly named José Rondeau Director, but because Rondeau was away with the Army of the North, Álvarez Thomas was appointed interim Director and took the oath on May 6, 1815.

Challenges of his interim rule
His tenure faced strained relations with the Liga Federal and ongoing unrest in the Littoral region. In September 1815, Buenos Aires reoccupied Santa Fe with the Army of Observation, but the government’s power weakened after a federalist uprising succeeded in March 1816. Álvarez Thomas resigned on April 16, 1816; Balcarce became acting Director until the Congress in Tucumán appointed a permanent successor.

Later years
From 1824 to 1827 he served as minister plenipotentiary to Peru and Chile. Archives note the Álvarez mission to those countries. He also wrote an 1839 sketch about General Manuel Belgrano.

Exile and death
Opposition to Juan Manuel de Rosas led to periods of imprisonment and exile in Brazil, Chile and Peru. After Rosas fell in 1852, Álvarez Thomas returned to Buenos Aires and died on July 20, 1857.

Legacy
Historians view him as a key transitional figure between the centralist Directorio and the later federal configuration of the provinces, with a career spanning military, executive and diplomatic roles.