Then Samuel took the vial of oil, and poured it on his head, and kissed him, and said, Isn't it that Yahweh has anointed you to be prince over his inheritance?
Of course, the most important of these was No. 4.  Saul's possession of the Spirit of God, evidently in the same manner as in the various Judges, was precisely the event that prepared him to be king of Israel.