Estanislao José Antonio Lynch y Roo, was a naval officer and wealthy Argentine, the brother of the famous landowner of the "Rio de la Plata" captain Patricio Lynch and the grandson of an Irish immigrant, also Patrick Lynch. Estanislao was the third son of Justo Pastor Lynch (1755–1830) and Ana Bernardo Roo (d.1836).
During his period as an Officer in the Argentinian Army of the Andes protected his territory and liberated from the Spanish Crown, On 2 January 1817 the Buenos Aires city council appointed Estanislao Lynch as the major of Barracas.
Along with Chilean exiles and the Army of the Andes, he crossed the Andes to help liberate Chile.
Eventually, he retired from the army and expanded the family's businesses to Valparaiso where he settled and married Carmen Solo de Zaldívar y Rivero, a lady from the Chilean high-society, the couple settled in Chile and issued: