He was born in
Asunción into a prominent family of Juan Andres Gill and Escolástica Garcia del Barrio y Bedoya. He was the grandson of Don Juan Miguel Gill, one of the founding fathers of
Paraguayan Independence and a member of the
Cabildo, who had
Celtic blood. He was married to Maria Concepcion Diaz de Bedoya. His paternal ancestor, John Thomas [El inglés] McGill (
Tomas McGill) was born in Ireland and migrated to Latin America with his brother. The family shortened the surname to
Gill when dictator
José Gaspar Rodríguez de Francia decreed that prefixes in foreign names should not be used anymore In 1854 he traveled to Buenos Aires, Argentina where he pursued secondary education and medical training, which he did not complete. He returned to
Paraguay in 1863. When the
Paraguayan War was declared against
Argentina, he enlisted in the 40th battalion, which comprised young men of high social position. Because of his knowledge of medicine, he was appointed to the military health division and served as a medical orderly. Gill was captured in the last days of December 1868 after the
Battle of Lomas Valentinas. In mid-January 1869 Gill was among those who returned to Asunción, where the Allies freed him and others on condition that they would not join the army again. ==Political career==