Final answer:
There is archaeological evidence for the existence of King David, but the Bible does not explicitly state whether Saul knew that God had replaced him with David.
Step-by-step explanation:
According to the Bible, Saul and David are two key figures in the history of ancient Israel. While the Bible provides conflicting accounts of how they became kings, there is archaeological evidence for the existence of King David. The Tel Dan stele, discovered in the Golan Heights, refers to the "house of David," indicating the kingdom of David.
With regard to whether Saul knew that God had replaced him with David, the Bible does not explicitly state Saul's awareness of this. However, there are instances in the Bible where Saul becomes aware of David's rise to power and perceives him as a threat. For example, in 1 Samuel 18:8-9, Saul becomes jealous of David's military success and is troubled by the praise David receives from the people, which suggests that he may have had some awareness of David taking over his place.