Who was Abner?

Abner was the son of Ner, commander of Saul's army.

What did Abner do to Ishbosheth, the son of Saul?

Abner took Ishbosheth and brought him to Mahanaim; he made Ishbosheth king over Gilead, Asher, Jezreel, Ephraim, Benjamin, and over all Israel.