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In the 1400s the House of Habsburg had two main lines: the Albertinian line which held Austria and briefly Hungary and Bohemia, and went extinct following the death of Ladislaus the Posthumous in 1457, and the Leopoldine Line ruling in Syria and Tirol, which would go one to inherit Burgundy and Spain. At the time of the Albertinians' extinction the Leopoldine line was reduced to two adult males- Ferdinand III, who had but one son, Maximilian, in 1459, who would go on to be the progenitor of all the future Habsburgs; and his cousin Sigismund, who ruled Tirol and further Austria and died childless, allowing Ferdinand to inherit.

OTL the extinction of all the other branches of the family allowed Ferdinand to consolidate their holdings, but what if TTL his luck runs out and Ferdinand has no surviving sons at all? Thus when he dies the House of Habsburg goes utterly extinct in the male line.

The question then become, who inherits Burgundy, Spain, Austria, and the Empire? TTL Mary could marry into the Anjou or the Orleans dynasty, while I believe the Wittlesbach will make a play for the crown and also Austria due to a possible marriage into the Habsburgs. As their two main rivals are gone the Wittlesbach would seem the natural candidate for the Imperial throne.
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