King of Asturias, Galicia, & Leon Alfonso III was "the greatest of the Asturian kings, expanded his domains as far as Coimbra in the southwest and Burgos in the southeast." His successor, Garcia I (909-914) moved capital from the Asturia Mtns. to Leon. Alfonso reigned 866-910. {-ref.: Encycl.Brit., 1956 ed.; 21:117.}
Relationship Documented His uncle (great-uncle) was Alfonso II "The Chaste", per documents by Alfonso III concerning a donation of Santa Maria of Tineo to the Church of Santiago of Galicia
866 Alfonso III the Great becomes King of Asturias.