King of Leon, slain in the year 1037 by King Ferrando at Tamaron. Bermudo was the brother of Dona Sancha, Ferrando’s wife.
And in the year 1037 Ferrando slew Bermudo the King of Leon in battle, who was his wife's brother, and conquered his kingdom, and succeeded to it in right of his wife Dona Sancha.
And the brethren brought him their charters of King Ramiro, and King Bermudo, and King Alfonso, and of Gonzalo Moniz, who was a knight and married a daughter of King Bermudo, and of other good men.
And the King confirmed them, and he bade them make a writing of all which had passed between him and them at the siege of Coimbra; and when they brought him the writing, they brought him also a crown of silver and of gold, which had been King Bermudo's, and which Gonzalo Moniz had given to the Monastery in honour of God and St. Mamede.
And the King perceived that they spake rightly, and he called for Don Diego Ordonez, the son of Count Don Bermudo, who was the son of the Infante Don Ordonez of Leon, and bade him follow the Cid, and beseech him in his name to return; and whatever covenant he should make it should be confirmed unto him; and of this he ordered his letters of credence to be made out.