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alternatehistory.com
In my previous Habsburg thread: https://www.alternatehistory.com/forum/threads/emperor-ferdinand-iv.437297/
survival of Ferdinand IV created enough butterflies to prevent Jan Sobieski from taking Polish throne, among other changes. So this time I'll try with Leopold's younger brothers and watch what I'll get. So in December 1654 Eleonora Gonzaga gave birth to healthly twins-daughter Maria Anna Josepha and son, Ferdinand Joseph Alois, in February 1657, another son, Maximilian Francis is born. So we still have Emperor Leopold and there should be little changes untill 1666-then Margaret Theresa is going to marry, ITTL Ferdinand Joseph could marry her instead of Leopold, and live with her in Spain as heir to the Spanish throne, Leopold could marry Claudia Felicitas as his first wife, just earlier than IOTL (with additional brothers he would not be in hurry) ATL they have one surviving daughter, born in 1671, Maria Antonia. Maximilian Francis would be expected to start carrier in the Church, but...
Leopold IOTL was seriously ill in 1675, say ITTL he hasn't recovered. By this time Ferdinand Joseph likely lives in Spain with Margaret Theresa and their kids (not as inbred like OTL Margaret's children), so should we expect 18 y.o. Max to succeede Leopold on Imperial throne?