Alfonso VI of León and Castile
In 1076 the kingdom of Navarre passed into the hands of Alfonso VI of León and Castile. The Mozarabic Rite (sometimes called the Isidorean or Spanish Rite) was replaced with the Latin Rite. The Missal of Silos, a Mozarabic missal which is the oldest known Western manuscript on paper, was created in the monastery in the 11th century.