Ghezo
An empire called the Oyo had had the Dahomey pay taxes to them every year since 1730. Then in 1823, Ghezo refused to pay the tax the Oyo wanted. When the Oyo sent an ambassador to Ghezo to change his mind, Ghezo killed him. The Oyo then went to war with Ghezo and the Kingdom of Dahomey.  Ghezo defeated and killed the Oyo leader Ajanaku and won the war.