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- Maecenas is a follower of Caesar in Antony and Cleopatra.
- For Marcus see (Marcus) Brutus, (Marcus Aurelius) Lepidus, and Mark, which is often interchangeable with Marcus.
- Queen Margaret is a fairly epic character, one of the greatest in that respect in Shakespeare. She appears as a naive girl in Henry VI, Part 1 and as an embittered old woman in Richard III. She is a central character of the two intervening plays, Henry VI, Part 2 and Henry VI, Part 3, in which she is the wife of Henry VI and a leader of his armies. In her most notable scene she supervises the murder/execution of Richard Duke of York.
- For Mark Antony see Mark Antony.
- For Marquess see Marquess of Dorset, Marquess of Montagu and Marquess of Suffolk (under Duke of Suffolk).
- Matthew Gough is an enemy of Jack Cade's rebels in Henry VI, Part 2.
- The Mayor of York reluctantly supports the Yorkists in Henry VI, Part 3.
- Menas, a follower of Pompey, suggests cutting loose the boat where the triumvirs are feasting in Antony and Cleopatra.
- Menecrates is a follower of Pompey in Antony and Cleopatra.
- Metellus Cimber is one of the conspirators in Julius Caesar.
- Sir John Montgomery (historically Thomas Montgomery) is a minor Yorkist character in Henry VI, Part 3.
- Mortimer:
- Edmund Mortimer is a claimant to the English throne, and a leader of the rebel forces, in Henry IV, Part 1 and explains the Yorkist claim to the crown to Richard Plantagenet, Duke of York, in Henry VI, Part 1. He is a composite of two figures, a child claimaint and his adult uncle, both named Edmund Mortimer.
- Lady Mortimer, daughter of Glendower and wife of Edmund Mortimer, sings in Welsh in Henry IV, Part 1.
- Sir Hugh Mortimer is an uncle of Richard Duke of York in Henry VI, Part 3.
- Sir John Mortimer is an uncle of Richard Duke of York in Henry VI, Part 3.
- See also Jack Cade, who falsely claims to be one John Mortimer, a claimant to the throne.
- Mowbray:
- Lord Mowbray is a rebel leader in Henry IV, Part 2.
- Thomas Mowbray, Duke of Norfolk is Bolingbroke's enemy, exiled by Richard, in Richard II.
Read more about this topic: List Of Historical Figures Dramatised By Shakespeare