Image: Treaty of Madrid (1621): Grisons and Valtelline
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The Grisons (Graubunden) and the Valtelline
Signed on April 26, 1621 by French courtier François de Bassompierre and under the guarantee of the King of France, Louis XIII, and the Swiss Confederation, the Treaty of Madrid reinstated the Valtelline to the Grisons and the Chiavenna to the Spanish. In addition, it was granted religious amnesty to the Protestants in Valtelline, allowing them to practice their faith freely.
Source: University of Texas at Austin, Perry-Castaneda Library, Map Collection
From "The Cambridge Modern History Atlas" edited by Sir Adolphus William Ward, G.W. Prothero, Sir Stanley Mordaunt Leathes, and E.A. Benians. Cambridge University Press; London. 1912