Don't be silly.

The Persian Empire had basically abolished slavery. Xerxes is noted in particular for being a far kinder conquerer than the Greeks were proven time and again.

Whatever you can say about the fledgling democracy of the slave state Athens, it would be destroyed by Sparta eventually.

The wrong side won at Thermopylae.

My dad occasionally bought gay erotica when he was looking for muscle magazines, there's A LOT of crossover.