Abimelech

Facts:

Abimelech was a Philistine king over the region of Gerar during the time when Abraham and Isaac were living in the land of Canaan.

Abraham deceived King Abimelech by telling him that Sarah was his sister rather than his wife.
Abraham and Abimelech made an agreement regarding ownership of wells at Beersheba.
Many years later, Isaac also deceived Abimelech and the other men of Gerar by saying that Rebekah was his sister, not his wife.
King Abimelech rebuked Abraham and then Isaac for lying to him.
Another man by the name of Abimelech was a son of Gideon and a brother of Jotham. Some translations may use a slightly different spelling of his name to make it clear that he is a different person from King Abimelech.

(Translation suggestions: How to Translate Names)