Name
- North, Family1
- O'Brien, Donough, Earl of Thomond1
- O'Neill, Hugh, Earl of Tyrone, 1550-1616, http://isni.org/isni/000000...1
- Ordericas Vitalis1
- Ordnance Office1
- Organe, John, of London1
- Orléans, Louis, Duc d', son of Charles V of France1
- Ottoboni, Pietro, Cardinal and Bishop of Ostia and Velletri, 1667-17401
- Page-Turner, Gregory Osborne, 4th Baronet1
- Pakenham, Robert, Clerk of the Green Cloth1
- Parliament1
- Parre, Thomas1
- Paul V, Pope1
- Paulet, Family1
- Payn, John, citizen and armourer of London1
- Paynell, William1
- Pelham, Thomas, of Add MS 381461
- Pembroke, Family1
- Percy, Family1
- Percy, Henry, 1st Earl of Northumberland1