The map is outdated.
Greece legalized gay marriage because the current conservative government(which opposed it in the past) decided that it was more useful to deny the “gay marriage” as a weapon for the opposition and made it legal.
Still, only half of their mp supported the bill and the bill passed because the opposition supported it.
There was an Euclid that was a pupil of Socrates. He was a friend(and classmate i guess) of Plato.
https://en.wikipedia.org/wiki/Euclid_of_Megara
And dont worry, it wasnt just you who was confused
"Editors and translators in the Middle Ages often confused him with Euclid of Alexandria when discussing the latter’s Elements. "