Fulgencio Yegros was born in Quyquyho in 1780. He was the son of Tte. Cnel. José Antonio Yegros and María Angela de Franco de Torres. He was not only one that pusued a military career. He had a father, three brothers, and a few cousins that were in the military and in the congress when Paraguay gained its independence. He was influenced by family traditions, the American revolution, and the French Revolution. Yegros got married with Doña Josefa Facunda Speratti y Uriburu. They had 4 children.
Yegros was the creator of the first literary society, and he started first military academy in the independent Paraguay.

Yegros studied at the Convento de San Francisco in Asunción. A few years later, he joined the army. His military career had its beginning in La Ordenanza del Ejercito Español de 1768.

Yegros, a lieutenant of 21 years old, was a sent on an expedition by Governor Lázaro Rivera to a fort in San Carlos on the Apa River. He had his first combat experiences when he fought against the Portuguese in 1802. His second military campaign took place in 1807. He was part of the Paraguayan army that defended Buenos Aires against British invasion. He was wounded in the battle of Buseo. During his stay at Buenos Aires, Yegros read Guibert and Falard’s books on war tactics. Three years later, in 1810, Yegros was already a Captain.

Yegros was appointed as the governor of Missiones after his brilliant performances in Paraguarí and Tacuarí.

Yegros and Pedro Juan Caballero were the main figures in the Paraguayan Revolution in 1811. On May 16, Yegros marched his troop to Asuncion, joining the revolution. He arrived on May 21 and was welcome victoriously.

After the revolution, Yegros joined the congress. The new government was called the “Junta Superior Gubernativa”. Yegros was elected into office with Francia. In reality, Yegros was just like a puppet used by Francia. It has been said that Yegros was a man with little political amibition. He represented the nationalistic elite of the creole military. Three years later, the congress officially declared Francia as President.

After Francia became dictator, Yegros’ public life ended and he retired. He went back to his Santa Bárbara estate in Quyquyhó. A few years later, Yegros participated in a revolt. Their attempt to throw Francia out failed and Yegros was put into prison. Yegros’ short life ended with his execution on July 17, 1821. Although many believe that he was executed-shot, some believe that he committed suicide.