Bermudo III, king of León (born c. 1017)

Bermudo III or Vermudo III was the king of León from 1028 until his death. He was a son of Alfonso V of León by his first wife Elvira Menéndez, and was the last scion of Peter of Cantabria to rule in the Leonese kingdom. Like several of his predecessors, he sometimes carried the imperial title: in 1030 he appears as regni imperii Ueremundo principis; in 1029/1032 as imperator domnus Veremudius in Gallecia; and in 1034 as regni imperii Veremundus rex Legionensis. He was a child when he succeeded his father. In 1034 he was chased from his throne by King Sancho III of Pamplona and forced to take refuge in Galicia. He returned to power, but was defeated and killed fighting against his brother-in-law, Ferdinand of Castile, in the battle of Tamarón.

The Kingdom of León was an independent kingdom situated in the northwest region of the Iberian Peninsula. It was founded in 910 when the Christian princes of Asturias along the northern coast of the peninsula shifted their capital from Oviedo to the city of León. The kings of León fought civil wars, wars against neighbouring kingdoms, and campaigns to repel invasions by both the Moors and the Vikings, all in order to protect their kingdom's changing fortunes.