What is the first apparition Macbeth sees?

The prophecy is that Macbeth will become the Thane of Cawdor and then the King of Scotland. But Banquo's son, Fleance will become the next king after Macbeth. Banquo and Macbeth think the prophecy is ridiculous until Macbeth become Thane of Cawdor because the last Thane of Cawdor was tratior as he sided with the Norwegian Vikings during battle. The next Thane of Cawdor will be the ultamite tratior as he will kill the king to become King.