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In page Kingdom of Asturias:

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There are also myths about the Asturian monarchy that are rooted in Jewish and Christian traditions rather than pagan ones: the Chronica ad Sebastianum tells of an extraordinary event that happened when Alfonso I died.[citation needed] While the noblemen were holding a wake for him, there could be heard celestial canticles sung by angels. They recited the following text of the Book of Isaiah (which happens to be the same that was read by the Mozarabic priests during the Vigil of the Holy Saturday):