After the death of her husband in 1035, Muniadona founded the monastery of San Martín de Tours de Frómista, and in her testament dated 13 June 1066, she requested to be buried there.
After the death of her husband in 1035, Muniadona became a nun. She founded the monastery of San Martín de Tours de Frómista, and in her testament dated 13 June 1066, she requested to be buried there.