Alfonso III (c.838 - December 20 c.910), surnamed the Great, was king of León from 866 to ca 910. Of him also nothing is really known except the bare facts of his reign and of his comparative success in consolidating the kingdom known as "of Galicia" or "of Oviedo" during the weakness of the Omayyad princes of Cordova. Upon his death his kingdom was divided among his 3 sons. The eldest son, Garcia became king of Leon but died shortly after in 914 without an heir. The second son Ordono reigned Galicia since 910 and León after Garcia's death. The youngest son Fruela received Asturias and became king of Asturias (or Oviedo as the capital was located there). The territory of Alphonso was once again united under him as Ordono died with children too young to ascend. Fruela did not enjoy his joint monarchy long as he passed away the next year. Ordono's eldest son Alfonso succeeded.
Constant rivalry between the two kingdoms opened rifts that could be exploited by outsiders, and Sancho III "the Great" of Navarre (1004–35) absorbed Castile in the 1020s, and added León in the last year of his life, leaving Galicia to temporary independence.
Ordono II of Leon 910–924 and of the Kingdom of León 914–924
Fruela II of Leon 910–925 and of the Kingdom of León 924–925