Maria Leonarda Casas was born circa 1774, the daughter of Juan Eligio Casas and Maria Rosalia Olivares.
In 1782, she lived at El Cojo. The church census recorded that she was a young child, casta, and 8 years old. Her household included 4 people:
Juan Eligio Casas, casta, married, age 33.
Maria Rosalia Olivares, casta, married, age 30.
Maria Josefa Casas, casta, a young child, age 4.
Maria Leonarda Casas, casta, a young child, age 8.