Career
Joseph Gregorio Belgrano began his military career as Standard-bearer, in the Regimiento de milicias de caballería de Buenos Aires. In 1800, Belgrano, traveled to Spain, and was appointed Adjutant of the Plaza de Buenos Aires, appointment certified by the King of Spain Carlos IV. Joseph Belgrano participated with great heroism in defense of Buenos Aires during British invasions of the Río de la Plata. During May Revolution of 1810, Belgrano was invited to participate in the Cabildo abierto, voted in favor of the dismissal of the Viceroy Baltasar Hidalgo de Cisneros.
The sisters Fernanda and Margarita were daughters of Francisco Rico and Isabel Ruedas Piña. descendants of Francisco Rueda and Antonio Piña natives of Seville.
Joseph Gregorio Belgrano was a remote descendant of Gonzalo Casco, and of Pedro Ramírez Reynoso (lieutenant), and Josefa Delgado (descended from Spanish conquerors).