Suero was the son of Rodrigo II Romanes de Monterroso and Milia de Wessex. The date and place of his birth have not been found.
Suero Gallego de Monterroso
Rodrigo II Romanes de Monterroso
Roman Fruelaz de Monterroso
Fruela I Alfonsez de Asturias (0722-0768)
Hermesenda Romaes
Teresa Arias
Arias Peres
Milia de Wessex