"Several monarchs had titles used in diplomatic settings which were not part of their official national royal style, but which signified their nationality."
Examples:
Britannic Majesty
Prussian Majesty
Apostolic Majesty
(Most) Catholic Majesty
(Most) Christian Majesty
(Most) Faithful Majesty
What would be an apt appellation for a Christian King of Jerusalem, granted by the Pope in the 14th century? I want something suitably pretentious. Some ideas:
Davidic Majesty
(Most) Devout Majesty
Israelite Majesty
(Most) Glorious Majesty
(Most) Holy Majesty
All help appreciated.