Conundrum: Henriad
Tuesday, November 13th, 2007England has had eight kings named Henry, all before Shakespeare was born.
How many of the eight appear as characters in Shakespeare’s 37 canonical plays?
For your answer to be valid, please list each such Henry, and at least one play in which he appears. It is not necessary to list all of the plays in which each Henry appears, but maybe we can do that after the Conundrum is solved.
Note: The Henry does not need to have been king at the time – nor, for that matter, called Henry.
UPDATE: Question answered by K-Lyn. See comments for answer.