OTL, such a thing nearly happened. The youngest son of Jan the Blind, King of Bohemia and Count of Luxemburg, Wenceslas, was born in 1337. From 13 December 1337 he was to marry a princess of Lorraine (either the then duke's sister, Marguerite) or a daughter should the duke, Raoul, have one by his second wife (Raoul had twin girls born in 1343, but both died young).
Now, Jan died at the Battle of Crècy in August 1346. As did Raoul. However, the contract had been broken just a month before that (3 July 1346).
Here's my question...say Jean of Lorraine is born female, and assume a butterfly net until after Crècy. The contract seems unlikely to be broken. Raoul had no brothers, and his father's brothers had likewise died with no issue. In fact, you have to go all the way up to Ferry I's fifth son, Henri 'le Lombard' to find a legitimate male line of the house of Lorraine that is still extant (and the direct male line of Henri dies out in 1347). Nor can anyone predict in February 1346 that Raoul will be dead in six months.
Wenceslas and his Lorrainer bride likely get married - Johanna of Brabant is a widow since September 1345 already and until 1352, when her youngest brother Godefroi dies, no one can know she'll succeed her dad. What happens next?
Now, Jan died at the Battle of Crècy in August 1346. As did Raoul. However, the contract had been broken just a month before that (3 July 1346).
Here's my question...say Jean of Lorraine is born female, and assume a butterfly net until after Crècy. The contract seems unlikely to be broken. Raoul had no brothers, and his father's brothers had likewise died with no issue. In fact, you have to go all the way up to Ferry I's fifth son, Henri 'le Lombard' to find a legitimate male line of the house of Lorraine that is still extant (and the direct male line of Henri dies out in 1347). Nor can anyone predict in February 1346 that Raoul will be dead in six months.
Wenceslas and his Lorrainer bride likely get married - Johanna of Brabant is a widow since September 1345 already and until 1352, when her youngest brother Godefroi dies, no one can know she'll succeed her dad. What happens next?