Most Faithful Majesty (Portuguese: Sua Majestade Fidelíssima) was the title used by the Portuguese monarchs, from 1748 to 1910.
The sobriquet Most Faithful King (Latin: Rex Fidelissimus, Portuguese: Rei Fidelíssimo) was a title awarded by the Pope Benedict XIV – as spiritual head of the Catholic Church – in 1748, to King João V of Portugal and to his heirs.
[1] The title Fidelissimus remains attached to monarchs descended from whoever received the original sobriquet.
The sobriquet can be awarded to either a king or a queen.
The monarchs of other countries have received similar titles from the Pope: This Portugal-related article is a stub.