This page will detail the various styles used by royalty and nobility in Europe, in the final form arrived at in the nineteenth century.[why?]
Only those classified within the social class of royalty and upper nobility have a style of "Highness" attached before their titles.
Monarchs also typically have a longer style than other princely members within the same royal house.
For example, the monarch of the United Kingdom has a much longer style than that of other members of the British royal family.
The full style and titles of King Charles III in the United Kingdom are "His Majesty Charles the Third, by the Grace of God, of the United Kingdom of Great Britain and Northern Ireland and of His other Realms and Territories King, Head of the Commonwealth, Defender of the Faith".