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1140 CE
1150 CE
1160 CE
1170 CE
1180 CE
1190 CE
1200 CE
1210 CE
1220 CE
1230 CE
1240 CE
1145 CE: Cathars appear in Southern France.
1160 CE - 1200 CE: Catharism becomes increasingly popular in Southern France; the Church tries to suppress the heresy.
1167 CE: Cathar Council of Saint-Felix held to determine bishoprics and set rules.
1209 CE - 1229 CE: The Albigensian Crusade against Cathars heretics in southern France.
1243 CE - 1244 CE: Siege of the last Cathar stronghold Montsegur.
1244 CE: Fall of Montsegur; Cathars are massacred by the Church's army and the heresy is suppressed.