ultima ratio regum

ultima ratio regum The final argument of kings. Louis XIV of France, recognized that force is the final argument, so he directed that his cannons carry the engraving 'ultima ratio regum' (1650). As a result, this phrase usually signifies 'war' or 'the use of military weapons; force'. The phrase was adopted in the form of 'Ultima ratio regis' for th
Found on http://www.wordinfo.info/words/index/info/view_unit/2218/

Ultima Ratio Regum

Ultima ratio regum is Latin for The last argument of kings
Found on http://www.probertencyclopaedia.com/YS.HTM
No exact match found