| Preliminary and Secret Treaty between the French Republic and His Catholic Majesty the King of Spain, Concerning the Aggrandizement of His Royal Highness the Infant Duke of Parma in Italy and the Retrocession of Louisiana. | |
|---|---|
 North America; Louisiana-New Spain in purple | |
| Context | Spain agrees to exchange Louisiana with France for territories in Italy |
| Signed | 1 October 1800[1] |
| Location | Real Sitio de San Ildefonso |
| Negotiators | |
| Parties | |
| Full text | |
 Treaty of San Ildefonso at Wikisource | |
The Third Treaty of San Ildefonso was a secret agreement signed on 1 October 1800 between Spain and the French Republic by which Spain agreed in principle to exchange its North American colony of Louisiana for territories in Tuscany. The terms were later confirmed by the March 1801 Treaty of Aranjuez.
- ^ "Treaty of San Ildefonso : October 1, 1800". The Avalon Project. Yale Law School.