In Shakespeare's Macbeth, King Duncan was the king of -

Macbeth, tragedy in five acts by William Shakespeare, written sometime in 1606–07 and published in the First Folio of 1623 from a playbook or a transcript of one.
- Some portions of the original text are corrupted or missing from the published edition.
- The play is the shortest of Shakespeare’s tragedies, without diversions or subplots.

Story:
- Macbeth and Banquo, who are generals serving King Duncan of Scotland, meet the Weird Sisters, three witches who prophesy that Macbeth will become thane of Cawdor, then king, and that Banquo will beget kings.

- Three witches tell the Scottish general Macbeth that he will be King of Scotland.
- Encouraged by his wife, Macbeth kills the king, becomes the new king, and kills more people out of paranoia.
- Civil war erupts to overthrow Macbeth, resulting in more death.


William Shakespeare's comedy:
- Measure for Measure (Dark Comedy)
- As You like It
- The Winter's Tales etc

William Shakespeare famous tragedies are:
- Romeo and Juliet
- Julius Caesar
- Othello
- King Lear etc

Source: Britannica and Shakespere.org