Albert Barnes Commentary 1 Samuel 11:15

"And all the people went to Gilgal; and there they made Saul king before Jehovah in Gilgal; and there they offered sacrifices of peace-offerings before Jehovah; and there Saul and all the men of Israel rejoiced greatly." — 1 Samuel 11:15 (ASV)

Made Saul king - The Septuagint has another reading, and Samuel anointed Saul king there. The example of David, who, besides his original anointing by Samuel (1 Samuel 16:12–13), was twice anointed—first as king of Judah (2 Samuel 2:4) and again as king over all Israel (2 Samuel 5:3)—makes it probable that Saul was anointed a second time. This, however, may be included in the phrase “made king” (see 1 Samuel 12:3, 1 Samuel 12:5).