Montjoie Saint Denis!

It allegedly refers to Charlemagne's legendary banner, the Oriflamme, which was also known as the "Montjoie"[1] and was kept at the Abbey of Saint Denis, though alternative explanations exist.

The Catholic Encyclopedia suggested it originated in a term for marking stones or cairns set up on the roadside – in Late Latin known as mons Jovis – which from c. 1200 in French appears as monjoie.

[2] "Montjoie" has also been proposed as being derived from a Common Germanic phrase, *mund gawi ("pile of stones"),[b] supposedly used as a battle cry in a sense like "hold the line!".

A connection to Montmartre is re-affirmed by G. Bugler, who believed the "joie" came from a cognate of "Gau", or region, presumably translating the phrase as "the place of the hill of St. Denis".

This alternative Latin etymology is given by Gerhard Rohlfs, who connected it to "Mons Gaudii", a name given by medieval pilgrims to a point where one would get their first glimpse of their destination.

Coat of arms of the Kingdom of France with the royal motto and war cry : "Montjoie Saint-Denis!"