Treaty of San Ildefonso
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San Ildefonso is a town in central Spain, the summer residence of the Kings of Spain, where several treaties were signed; each is referred to, in context, as the Treaty of San Ildefonso (sometimes under the spelling Treaty of San Ildephonso). These treaties are:
- First Treaty of San Ildefonso of 1777 between Spain and Portugal
- Second Treaty of San Ildefonso of 1796 between Spain and France, allying the two nations
- Third Treaty of San Ildefonso of 1800 between Spain and France, by which Spain returned Louisiana to France