The Mozarabic Chant was first documented by St. Isidore of Seville in the seventh century. The Credo had already been introduced into the Mozarabic rite in the Third Council of Toledo . The Credo would not offiacially be used in the Roman rite until 1014, after approval from The Holy Roman Emperor Henry II.
The Mozarabic rite is very similar to the Ambrosian rite and Gallican rite, and it is very differnt from the Roman rite. The Roman rite moved into the position of the Mozarabic as the Christian reconquest of Hispania continued. Roman infulence was enforced throughout the Hispanic Church with a French abbot as the new archbishop of Toledo. Due to it's surpression by Pope Gregory VII, The Mozarabic rite is almost completely disappeared in all but six parishes in Toledo.
Cardinal Jimenez de Cisneros revived the Mozarabic rite and chant by publishing a Mozarabic Missal in 1502, although the revived chant was strongly influenced by the Gregorian chant anf does not resemble the Mozarabic chant as much as it should.
