Benaiah in Wikipedia

son of the priest Jehoiada, was David's general for the army of the Kingdom of Israel and his chief bodyguard (2 Sam 23:23). In Hebrew, his name means "God has built." He was one of David's "mighty men" (I Chron. 27:6) who commanded the Cherethites and Pelethites. He was renowned for his heroism; with Zadok and Nathan, he kept his position under Solomon, and was appointed chief of Solomon's army. In the Bible, Benaiah's story is told primarily in I Chronicles 27, II Samuel 23, and I Kings 1. The stories of him follow that he once killed an 8-foot-tall (2.4 m) Egyptian. Also he was said to have killed a lion in a snowy pit.