▁was ▁probably ▁present ▁at ▁the ▁Battle ▁of ▁the ▁Golden ▁Sp urs ▁in ▁ 1 3 0 2 , ▁and ▁fought ▁again ▁for ▁the ▁King ▁of ▁France ▁against ▁the ▁F lem ish ▁at ▁the ▁Battle ▁of ▁M ons - en - P év èle ▁in ▁ 1 3 0 4 . ▁When ▁the ▁cities ▁of ▁his ▁County ▁of ▁Fo ix ▁re bel led ▁against ▁the ▁Royal ▁tax ▁collect ors , ▁because ▁they ▁raised ▁the ▁tax es ▁to ▁fin ance ▁the ▁expensive ▁war ▁against ▁Fland ers , ▁Gast on ▁supported ▁his ▁cities . ▁For ▁this , ▁the ▁County ▁was ▁conf isc ated ▁for ▁a ▁while ▁by ▁the ▁S ene ch al ▁of ▁Car c ass onne . ▁ ▁In ▁ 1 3 0 8 , ▁he ▁started ▁a ▁war ▁against ▁the ▁Count ▁of ▁Arm agn ac , ▁against ▁the ▁orders ▁of ▁the ▁King , ▁who ▁had ▁forb idden ▁int ra - F rench ▁war fare . ▁Gast on ▁was ▁taken ▁prisoner ▁and ▁locked ▁up ▁in ▁the ▁Ch âte let . ▁He ▁was ▁only ▁released ▁after ▁pay ing ▁a ▁r ans om ▁of ▁ 3 6 , 0 0 0 ▁livres . ▁He ▁also ▁had ▁armed ▁conflicts ▁with ▁his ▁uncle ▁James ▁II ▁of ▁Major ca ▁and ▁even ▁with ▁his ▁own ▁mother , ▁who ▁firm ly ▁ruled ▁Fo ix ▁during ▁his ▁many ▁abs ences . ▁ ▁In ▁ 1 3 1 0 , ▁he ▁inherited ▁the ▁Vis count y ▁of ▁Mars an ▁from ▁his ▁a unt ▁Const ance ▁of ▁Mon c ada . ▁When ▁another ▁uncle ,