He was born circa 1743. His father was Miguel Saenz, and his mother was Maria Gerarda Hinojosa. His father owned Mier 73 grant.
He married Maria Margarita Gonzalez, daughter of Nicolas Gonzalez and Josefa Garcia on 19 Jul 1772. He was 29 years old, and the bride was 14 years old. Her father owned Mier 64 grant, Mier 60 grant, Mier 21 grant.
Gertrudis Saenz. She married Antonio Garcia Salinas, son of Juan Jose Garcia and Maria Josefa Salinas on 1 Nov 1800 in Mier.
Maria Antonia Saenz, baptized 24 Jun 1773. She married Jose Norberto Peña, son of Teodoro Peña and Gertrudis de la Garza on 1 Jul 1789.
Jose de Jesus Saenz, baptized 9 Oct 1774. He married Maria del Refugio Salinas, daughter of Juan Cristostomo Salinas and Maria Josefa Ramos on 21 Dec 1793.
Jose Vicente Saenz, baptized 13 Nov 1777. He married Maria Catarina Escobar, daughter of Jose Escobar and Antonia Garcia on 15 Oct 1797.
Maria Francisca Saenz, born 1777. She married Jose Marcelino de la Garza, son of Francisco Angel de la Garza and Maria Cayetana Peña on 3 Feb 1791.
Jose Antonio Saenz, born 1780. He married Maria Gregoria Hinojosa, daughter of Manuel Hinojosa [Jr.] and Juana Sanchez on 20 Nov 1792.
Maria Ignacia Saenz, born 1781. She married Pablo Jose de la Garza, son of Francisco Angel de la Garza and Maria Cayetana Peña in 1797.
In 1782, he lived in Santa Albina / San Gregorio del Salero in household number 86. The church census recorded that he was married, español, and 39 years old. His household included 10 people:
Gregorio Saenz, married, español, age 39.
Maria Margarita Gonzalez, married, española, age 24.
Maria Antonia Saenz, a child, española, age 8.
Jose de Jesus Saenz, a child, español, age 7.
Maria Francisca Saenz, a young child, española, age 5.
Jose Vicente Saenz, a young child, español, age 4.
Jose Antonio Saenz, a young child, español, age 2.
Maria Ignacia Saenz, a young child, española, age 1.
Maria Gerarda (Gertrudis) Hinojosa, a widow, española, age 61.
Maria Gertrudis Saenz, an unmarried girl, india, age 18.
In 1767, as an antiguo poblador, he was granted Mier 74 by the King of Spain.
AKA Geronimo Saenz