Dan - if you run Dieu et mon droit through Google translate you get: Dieu and mountain droit and you even get the suggestion that you should be translating from French!
Its sods law because usually I would have run it through google, but I took the work of my tutor. I happened to be walking out of the court on a day trip when I asked so never thought I needed to. I believe you mate. I had never come across it till I did law in 6th form and never actually became curious till uni.
Depending on which half of the year you were in would determine whether you did French or German for years 7/8 and then you had the choice to take Spanish or the other language or none. I got German and then chose to drop it for year 9 and did Spanish for my option.