| Antonio I | |
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| Reign | 3 January 1701 - 20 February 1731 (30 years, 48 days) |
| Predecessor | Louis I |
| Successor | Louise Hippolyte |
| Spouse | Marie of Lorraine |
| Issue | |
| Louise Hippolyte, Princess of Monaco Margherita Camilla, Princess of Isenghien |
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| Father | Louis I, Prince of Monaco |
| Mother | Catherine Charlotte de Gramont |
| Born | 25 January 1661 |
| Died | 20 February 1731 (aged 70) |
Antonio I (25 January 1661 – 20 February 1731) was the Prince of Monaco from 1701 to 1731. He was the elder son of Louis I, Prince of Monaco and Catherine Charlotte de Gramont.
In 1683 Antonio was named lieutenant in the Régiment du Roi Infanterie. In 1684 he was named colonel of the regiment of Soissonois. During the Nine Years War he was present at the Battle of Philippsburg (1688), the Battle of Fleurus (1690), the Siege of Mons (1691), and the Siege of Namur (1692).
On 21 August 1702 Antonio took the oath to King Louis XIV of France in the Parlement on account of being Duke of Valentinois and a Peer of France. He was made a knight of the French royal orders in 1724.
Antonio married 13 June 1688 Marie of Lorraine (12 August 1674 - 30 October 1724), daughter of Louis, Count of Armagnac. The marriage was arranged by Louis XIV in person.
They had six daughters of whom only two survived infancy :
Antonio also had a number of illegitimate children:
| Preceded by Louis I |
Sovereign Prince of Monaco 1701 – 1731 |
Succeeded by Louise-Hippolyte |
| Duke of Valentinois 1701 – 1731 |
Extinct |
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