In the titles of sovereigns, chiefly in Asia and Africa. Now historical.

An honorific epithet given to a reigning prince (esp. of Germany), formerly also to a member of a royal house, etc.; sometimes jocularly applied…

most religious: used in addressing or referring to royalty. Cf. Christian, adj. 1b. Now historical and rare.

esp. as an epithet of royalty. Now chiefly Historical or archaic; formerly often in the phrase His (her, your) most Sacred Majesty.

= serenissime, adj. n.

‘Most serene’; an honorific epithet bestowed on certain princes. Also n., one so entitled.

highly esteemed or exalted; spec. as an honorific epithet of a monarch.