Antonio Matias Guerra Cañamar was born circa 1777, the son of Juan Manuel Guerra Cañamar and Maria Isabel Treviño.
In 1782, he lived in Mier. The church census recorded that he was a young child, español, and 5 years old. His household included 6 people:
Juan Manuel Guerra Cañamar, español, married, age 40.
Isabel Maria Treviño, española, married, age 26.
Jose Francisco Guerra Cañamar, español, a young child, age 6.
Antonio Matias Guerra Cañamar, español, a young child, age 5.
Maria Tomasa Guerra Cañamar, española, a young child, age 2.
Jose Ysidoro Guerra Cañamar, español, a young child, age 1.