Decades: 1120s 1130s 1140s 1150s 1160s - 1170s - 1180s 1190s 1200s 1210s 1220s
Years: 1174 1175 1176 1177 1178 - 1179 - 1180 1181 1182 1183 1184
Third Council of the Lateran condemned Waldensians and Cathars as heretics; reformation of clerical life
Portugal and it's king are recognized by the Holy See as kingdom and king, respectibly. It is stated that from now on that Portugal is under the protection of the Holy See and God.
Snorri Sturlusson (Icelandic historian and author of the Younger Edda)
Heads of states
England - Henry II Curt Mantle, King of England (reigned 1154 - 1189).
France - Louis VII, King of France (reigned 1137 - 1180).