The so-called Claudius Pontificals are the texts in British Library, Cotton Claudius A.iii, a composite manuscript of three separate pontificals, i.e. compilations of the services reserved for bishops, especially the coronation of kings. The first two date to the 11th century, the third to the 12th century.
The manuscript on fol. 7 contains the original Latin form of the coronation oath of the English kings (attributed in a later hand to the coronation of Æthelred II, AD 978). 
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