Information on Kings of Scotland???

I really need help with this one!! I am doing a research project that I will eventually have to present on 'Kings of Scotland'. It is for my English cl in which we read the play Macbeth. The ignment is to talk about kings of Scotland, then relate it back to the literature, and then relate it to another piece of either music, art, etc, the follows the themes in which I will be speaking about. I have to decided to generally talk about the monarchies in Scotland and then highlight kings of significance. Does anyone know any kings of significance I could use? Or have any idea of the piece I will have to refer the topic back to? I heard of a movie "The Last King of Scotland"? Any reviews on that? Anything will be helpful!!