BTGuy: I’ve heard all of those things about Columbus too. I asked several experts in the field and they said they are all false.
Gaddafi has an aunt who claims to share a maternal grandmother who also claims she’s Jewish.
I guess Castro could be from a Maranno family. That’s not how I heard he was Jewish but that could be. I don’t know the relevant positions of the Poskim about what to do about 20th-century Maranno families though.
I never heard that about the Hilarya so I never looked into it.