When Magdalena Cobeaga Zaracondegui was born on 22 December 1795, her father, Juan Anttonio Cobeaga Echaniz, was 32 and her mother, Ysabela Zaracondegui Arrascada, was 40. She married Santiago Achaval Basterechea on 25 August 1817. They were the parents of at least 2 sons and 5 daughters.