What is the treatty of kato?

Answer 1

The 1559 Treaty of Cateau, to which you are likely referring, marked the end of a 65-year conflict between Spain and France (and, by extension, England, which supported France during the latter years). While there were several minor points of conflict during the 65 years leading up to this treaty, the major struggle was for control of Italy. The treaty established Spain as the victor in this struggle. The treaty's name was drawn from Cateau-Cambrésis, the town in northern France where it was signed.