Sale of Upper Alsace to Charles the Bold (1469)

In 1469, Sigismund of Austria transferred Upper Alsace to Charles the Bold of Burgundy. Sources describe the transaction as a sale for 50,000 florins or a pawned fiefdom for a loan and alliance, motivated by Sigismund's need for protection against Swiss expansion and Charles's territorial ambitions.

Episodes

Background and detail

Political Context. Sigismund, Duke of Further Austria, controlled Swabian territories including the Sundgau in southern Alsace. Charles the Bold, Duke of Burgundy, sought to create a contiguous kingdom from the North Sea to Savoy. Sigismund faced pressure from the Old Swiss Confederacy, prompting him to seek Burgundian protection for his Rhine lands.

The Sale. On 21 March 1469, Charles received Sigismund at his court to negotiate the purchase. The deal involved the Alsace landgraviate, the County of Pfirt, and the Breisgau. Sources describe this as a sale for 50,000 Rhenish florins or a pawned fiefdom for a loan and alliance, with the specific date of the final acquisition recorded as 9 May 1469.

Immediate Consequences. Charles was determined to retain the territory, refusing offers from Alsatian cities to buy it back. This acquisition became a central point of contention in the later Burgundian Wars, where Charles fought to maintain ownership against the Lower League, an alliance of Swiss, German, and Alsatian polities.

People involved

Sources

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