This question is based on William Shakespeare's Macbeth.
It is dramatic irony that the 'castle which has a gentle air' happens to be the
The 'castle which has a gentle air' is the death-place of King Duncan in William Shakespeare's Macbeth. This is an example of dramatic irony because the audience knows that the castle is the site of the murder of the king, while the characters in the play do not. The description of the castle as having a gentle air creates a contrast between its appearance and the violent act that takes place there, which adds to the dramatic effect of the play.