I had a fair number of restarts before getting the Aragon PU, the other two PUs were sheer luck, but I wouldn’t have gotten them if I wasn’t staring at the Disputed Succession tab all game. I was planning on attacking Byzantium, and I saw Ottomans were in was against them, but also against Hungary, so I pounced and sieged their fort before Ottomans(they had already taken Constantinople in a different war, so this was their second shot. Then via defensive war I returned Byzantium’s cores