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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 the King John V of Portugal and to his heirs.
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 only European monarchy that has received the sobriquet was the now-defunct monarchy of Portugal.
References
Most Faithful Majesty Wikipedia(Text) CC BY-SA