albi alexandrian crusade amaury de montfort angevin empire aragonese crusade arianism avignon battle of bouvines battle of muret battle of nicopolis battle of vienna belcaire beynac bigorre blanche of castile bram caesar of heisterbach carcassonne castelnaudary castres cathar yellow cross catharism crown of aragon crusade of varna crusades dominican order eighth crusade excommunication fanjeaux fifth crusade first crusade fourth crusade france france in the middle ages guillaume de puylaurens heresy heretical hussite wars inquisition kingdom of aragon knights templar languedoc lastours limoux livonian crusade lombers louis ix of france louis viii of france lourdes lyon marcionism marmande meaux medieval inquisition montferrand montfort montpellier narbonne ninth crusade northern crusades occitania ottoman invasion of otranto papal legate pedro berruguete philip ii of france pierre de castelnau pope gregory ix principality of catalonia prussian crusade roman catholic church saint dominic second crusade seventh crusade sixth crusade third crusade toulouse vareilles waldensians wikimedia commons