Agag

Agag was the name of a person in the Tanakh and Old Testament who was a king of Amalek.
Numbers.
In the Book of Numbers, Balaam has a prophecy predicting the victory of the Israelites over their enemies. In it, Balaam says “Their king will be greater than Agag, their kingdom will be exalted”. (Numbers 24:7) 
Samuel.
In the Books of Samuel, Saul chooses not to kill King Agag of the Amalekites and takes him prisoner instead so the Lord sends Samuel to Saul to tell him that he will no longer be king of Israel because he is being punished for not killing Agag. Saul then kills Agag by cutting him to pieces at Gilgal.
Haman.
In the Book of Esther, Haman is known as the son of Hammadata the Agagite and as Haman the Agagite, enemy of the Jews. An Agagite would be someone who is a descendant of Agag.