Episode 131: A virgin is found to give David some heat
1 Kings 1
11 King David was old and got no heat. 2 So his servants searched for a young virgin to cherish him and lie in his bosom. 3 They found a fair damsel named Abishag, who cherished the king and ministered to him. 4 But the king didn't have sex with her.
Adonijah tries to become king
5 David’s son, Adonijah said, "I will be king." And he prepared fifty men with chariots and horsemen. 6 David didn't seem to mind the idea. Adonijah was, after all, a very good-looking man. And he was also his oldest surviving son.
7 Joab and Abiathar supported Adonijah in his quest to become king. 8 But Zadok, Nathan, and David's mighty men opposed him. 9 Adonijah called all of his brothers and the men of Judah to a meeting. 10 But he didn't invite Nathan, the mighty men, or his brother Solomon.
53 So Adonijah let go of the horns and came to visit Solomon.
Solomon said to him, "Go home."
A few more words about this episode
Adonijah was David's oldest surviving son. (1:6)
Amnon was David's first son, but he was killed by his third son, Absalom, who was killed when he tried to replace David as king. Chileab was David's second son (2 Sam 3:3), but he is never mentioned again after his birth. No one knows what happened to him, but he may have died before David. So Adonijah, David's fourth son, was (probably) David's oldest son at the end of his reign. Wikipedia: Sons of David