Easton's Bible Dictionary (1897)
Man of shame or humiliation, the youngest of Saul’s four sons, and the only one who survived him (2 Sam. 2-4). His name was originally Eshbaal (1 Chr. 8:33; 9:39). He was about forty years of age when his father and three brothers fell at the battle of Gilboa. Through the influence of Abner, Saul’s cousin, he was acknowledged as successor to the throne of Saul, and ruled over all Israel, except the tribe of Judah (over whom David was king), for two years, having Mahanaim, on the east of Jordan, as his capital (2 Sam. 2:9).
After a troubled and uncertain reign he was murdered by his guard, who stabbed him while he was asleep on his couch at mid-day (2 Sam. 4:5-7); and having cut off his head, presented it to David, who sternly rebuked them for this cold-blooded murder, and ordered them to be immediately executed (9-12).
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
ISH'-BO'SHETH(man of shame), son and successor of Saul, was persuaded by Abner to go up to Mahanaim and assume the government while David reigned at Hebron, 2 Sam 2:8, 2 Sam 2:11; and all Israel except Judah acknowledged him as king. A severe battle soon after occurred at Gibeon, between the army of David, under Joab, and the army of Ish-bosheth, under Abner, in which the latter was utterly defeated. Abner was killed afterward by Joab. Ish-bosheth, thus deprived of his strongest supporter, was assassinated at noonday upon his bed after a brief reign of two years. 2 Sam 4:5-7.