Who is Duncan?

Duncan, the King of Scotland, is said by Macbeth to be virtuous and meek in his conduct in office and in his bearing. He seems to be regarded as a good king and, on the battlefield, he appears to be a competent leader who confronts both a rebellion and an invasion. He announces hison Malcolm as the prince of Cum berland, the next in line to the Scottish throne. Duncan does not seem to be a particularly good judge of character, since he misjudged both the former thane of Cawdor and his designated replacement, Macbeth who murders Duncan in his sleep.