Záviš, Lord of Falkenstejn married a heiress to Hungary, Elisabeth of Hungary, there is a certain dispute who is older, her sister, Maria or herself, they had a son as well - is it possible for Zavish to claim the Hungarian throne?
So if I got this right, Zaviš had a claim to the Hungarian throne through both of his wives, but the claim through the first one was very weak?
In the second case, Zaviš would have a pretty good position, but he'd have to survive Ladislaus IV first...his special relationship with the Cumans got him into quite a lot of danger, so he could plausibly die in 1288.