- Manzoli, Marchione1
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- Margarita, de Austria, Queen, consort of Philip III, King of Spain, 1584-16111
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Mariano, Fra1
- Maritime law1
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- Mayenne, Charles de Lorraine, Duc de, 1554-16111
- Medici, Carlo de'1
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- Medici, Giuliano de', 1453-14781