Name
- Llywarch Offeiriad1
- Llywelyn ab Jorwerth, Prince of North Wales1
- Llywelyn ab Owain1
- Mabclaf ab Llywarch, alias Mab Clochyddyn1
- Mason, Morgan1
- Meredith, Family1
- Morgan ab Huw Lewis1
- Morgan, John, Reverend; of Add MS 148661
- Morgan, Rowland1
- Morris, Henry, of Add MS 148981
- Morris, Hugh1
- Morris, John, of Add MS 148801
- Morris, Lewis, alias Llywelyn Ddu1
- Morris, William, alias Gwilym Cybi1
- Morys Berwyn1
- Morys ab Evan ab Einion, alias Morys Dwyfech1
- Morys ab Howel ab Tudur1
- Morys ab Llywelyn1
- Owain, Person1
- Owen, Humphrey, of Add MS 148661