The sobriquet Most faithful king (Rex Fidelissimus) was a title awarded by the Pope as spiritual head of the Catholic Church to a monarch. In practice, apparently only one monarchy, Portugal, has ever received it.

The title 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 Fidelissimus was the now-defunct monarchy of Portugal. King John V of Portugal was favoured with the title of Rex Fidelissimus in 1748 by Pope Benedict XIV.

[edit] See also

• Fidei defensor
• Apostolic Majesty
• Rex Christianissimus
• Catholic Majesty

v • d • e Styles used by monarchs and royalty Reigning monarchs His Holiness (HH) • Apostolic Majesty (HAM) • Imperial and Royal Majesty (HI&RM) • Imperial Majesty (HIM) • Royal Majesty (HRM) • Majesty (HM) • Catholic Majesty (HCM) • Most Christian Majesty (HMCM) • Most Faithful Majesty (HFM) • Britannic Majesty (HBM)• Royal Highness (HRH) • Exalted Highness (HEH) • Highness (HH) • Serene Highness (HSH) Imperial Crown of Austria Members of sovereign and noble families Imperial and Royal Highness (HI&RH) • Imperial Highness (HIH) • Royal Highness (HRH) • Grand Ducal Highness (HGDH) • Highness (HH) • Ducal Serene Highness (HDSH) • Serene Highness (HSH) • Illustrious Highness (HIll.H)