He was also the inspiration and historical basis for the play Munio Alfonso, the second by Cuban playwright Gertrudis Gómez de Avellaneda, first staged in Madrid in 1844.
[1] After repenting of the act he sought to make a pilgrimage to Jerusalem but, at Alfonso's urging, the Archbishop of Toledo, Raymond de Sauvetât, forbid him to go, instead requiring him to engage in continual warfare with the Andalusian Muslims as a penance.
[2] The author of the Chronica Adefonsi imperatoris accuses Muño of neglecting the castle of Mora, keeping it insufficiently stocked to resist a large-scale attack.
On hearing of his successes Alfonso called Muño to court and made him vice-governor of Toledo, placing all the cavalry and infantry of the Trans-Sierra under his authority.
[6] While Alfonso was in Andalusia, Farax of Calatrava allied with the Almoravid commanders along the Guadalquivir intending to re-fortify Mora and prepare an ambush for Muño.
Before sunrise on 1 August Muño with forty knights left Peña Negra under the command of Martín in order to scout enemy movements in the hills near Calatrava.
They captured a solitary spy hiding in cave, who was divulging the details of Farax's expedition when the Muslim governor's vanguard appeared on the horizon.
The head was sent to Córdoba to the house of the widow of Azuel, then to Seville to Abenceta, and finally it was carried to the Almoravid sultan Texufin and all over Morocco to pronounce Muño's death.