He was born circa 1761. His father was Juan Francisco Saenz, and his mother was Maria Teresa Peña. His father owned Porción 7, Mier. In 1782, he lived in San Pedro de las Flores in household number 74. The church census recorded that he was a youth, español, and 19 years old. His household included 9 people.
He married Maria Isidra Flores, daughter of Bartolome Flores and Maria Rita Vela on 2 Sep 1782 in Mier. He was 21 years old, and the bride was 17 years old. Her father owned Porción 13, Mier.