Sentence:  [T]he Catholick King complained very much thereof, upbraiding the moſt Chriſtian King how ill this did correſpond to the ſo many aſſiſtances which were given by "Spain" to "France" ſince that from thence ſo great a <WSD>fomentation</WSD> was now preparing to his Rebels in "Flanders". 
Meaning of the word marked with <WSD> tags:  Encouragement; excitation; instigation.