Curialia Miscellanea, or Anecdotes of Old Times / Regal, Noble, Gentilitial, and Miscellaneous: Including Authentic Anecdotes of the Royal Household, and the Manners and Customs of the Court, at an Early Period of the English History

by Samuel Pegge

"His most Christian Majesty The King of France."

Stowe says that Charlemagne, being chosen Emperor, A.D. 800, on account of his great zeal for the good of Christendom, was the first King of France that attributed to himself (I rather think received from the Pope) the Style and Title of The Most Christian King of France; and from him his Successors have continued it[177].