Alfonso III of Asturias
References

Preceded by Ordoño I
King of Asturias 866–910
Succeeded by Fruela II
Preceded by Ordoño I
King of León 866–910
Succeeded by García I
New title
King of Galicia
Succeeded by Ordoño II

Question: Alfonso III was king of which three places starting in 886?
Answer: Alfonso III was the king of León, Galicia and Asturias starting in 866.