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Whilst there is no degree in Freemasonry higher than that of Master Mason, the degree of the Holy Royal Arch is of great antiquity, and has a special importance in many masonic systems, including those of all three of the oldest 'Constitutions' (masonic authorities), namely the Grand Lodges of England, Scotland, and Ireland, in all of which it is considered (by varying constitutional definitions) to be the completion of the mainstream masonic structure.
Different Grand Lodges and their regions show subtleties of tradition and variation in the degrees and practice; for example under the Grand Lodge of Scotland, the Mark Degree (which is unrecognised by the United Grand Lodge of England, but has a separate Mark Grand Lodge) is integrated into "The Craft" as a completion of the second degree.