They got their heads chopped off.
Unlike the leaders of our enlightened democracy, Ferdinand and Isabella took their oaths to defend the realm seriously. Enemies foreign and domestic weren’t allowed to roam the land at will, subverting the culture and killing the people. They were done away with.
Sooner or later, we’ll either do away with our own internal enemies, or they will do away with us.
Because oven-building and gas-generation technology wasn't up to snuff back then.