Blazon: Per quarterly I and IV o five torteaux in orle, in chief a roundel of France (Medici), II and III gules a fess argent (Austria)
These are Marie’s arms from before her marriage. In a classic example of quartering, the first and fourth quarters display the arms of her father, Francesco I de’Medici, Grand Duke of Tuscany, while the second and third come from her mother, Archduchess Joanna of Austria. Since both parents were armigers, all of their children would have been entitled to bear their arms quartered. Upon marrying King Henry IV of France, she would have quartered his arms in the first and fourth quarters with the above arms in the second and third.