In my last game as Madyas, France was ruled by the de' Medicis while Austria was ruled by the Hohenzollerns (Brandenberg-Prussia's House) and were Protestant. I deemed it highly cursed and cried for three hours. Also, the Ottomans were part of the Catholic side and they STILL lost!
Then there's the not-quite-REVEAL, but what happened later, where my ally Britain suddenly didn't answer when Ming China decided that Taiwan was actually Chinese and they were going to use their French Medici allies, who wanted New Madyas (Mexico), to beat me into the ground. I was ready to fight with my pal Britain... but I found I had a truce with them instead, but I didn't get a message that they dishonored the call. I investigated, and they had become the junior partner of HOLLAND. Not even through the super-rare event, just... naturally.
I used some *ahem* temporal magic to undo the PU (I had actually given up and allied Russia, they just got a real heir that time.) but I do have the proof of France/Austria's dynasty.
Please ignore the fact I am currently getting destroyed by France/Spain (campaign-killer, sadly...), and also what I have done to the Ottomans.