Semper fidelis

Semper fidelis (usually shortened to Semper Fi) is a Latin phrase that means "always faithful" or "always loyal". In the United States it is best known as the motto of the United States Marine Corps. Elsewhere, it is a common motto for towns, families, schools, and military units.

The earliest definitively recorded use of semper fidelis is as the motto of the French town of Abbeville since 1369. It has also been used by other towns, and is recorded as the motto of various European families since the 16th century, and possibly since the 13th century or earlier. Records show many families in England, France and Ireland using this motto.

The earliest recorded use of semper fidelis by a military unit is by the Duke of Beaufort's Regiment of Foot, raised in south-western England in 1685. This is apparently linked to its use as a motto by the city of Exeter since no later than 1660. Subsequently, a variety of military organizations adopted the motto.

This phrase was used in Europe, at least in Great Britain, Ireland and France and probably in other countries as well. A more recent adoption is by Senator Joe Doyle, in arms granted by the Chief Herald of Ireland in 1999.

Bernard Burke in 1884 listed many notable families in Great Britain and Ireland using the motto "Semper fidelis" in their coats of arms. They include:

Burke's full list of families using the motto was: Booker, Barbeson, Bonner, Broadmead, Carney, Chesterman, Dick, Dickins, Duffield, Edge, Formby, Frisby, Garrett, Haslett, Hill, Houlton, Kearney, Lynch, Lund, Marriott, Nicholls, Onslow, Pollexfen, Smith, Steele, Steehler, Steuart, Stirling and Wilcoxon. A large portion of these families were Irish or Scottish.

Chassant and Tausin (1878, p. 647) list the following French families as using it: D'Arbaud of Jonques, De Bréonis, Chevalier of Pontis, Du Golinot of Mauny, De Coynart, De Genibrouse of Gastelpers, Macar of the Province of Liege, Milet of Mureau, Navoir of Ponzac, De Piomelles, De Poussois, De Reymons, and De Rozerou of Mos.

...
Wikipedia