Secret Signing of the Third Treaty of San Ildefonso
- When
- 1 October 1800
- Where
- San Ildefonso, Spain
On 1 October 1800, Spain and the French Republic secretly agreed that Louisiana would return to France in exchange for Italian territories.
The Third Treaty of San Ildefonso was a secret agreement signed on 1 October 1800 between Spain and the French Republic. Spain agreed in principle to exchange its North American colony of Louisiana for territories in Tuscany. The treaty was negotiated by French general Louis-Alexandre Berthier and the Spanish former Chief Minister Mariano Luis de Urquijo. Its terms were later confirmed by the March 1801 Treaty of Aranjuez.
Sources
- Third Treaty of San Ildefonso Wikipedia, revision of 2026-08-11
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