and David arose and went, he and his men, and killed of the Philistines two hundred men; and David brought their foreskins, and they gave them in full number to the king, that he might be the king's son-in-law. Saul gave him Michal his daughter as wife.
Of course, he was not aware of the fact that God had chosen David to be the king, and that God had anointed David to be king over Israel. So it is interesting that immediately he began to suspicion the fact that the kingdom was in jeopardy. "What does he want more than this, the kingdom?"