We have significant amounts written by the Ancient Greek equivalent of a Sparta otaku, Thucydides. He lived there for a significant period (IIRC, he was in exile from Athens at the time) and was firsthand familiar.
We have significant amounts written by the Ancient Greek equivalent of a Sparta otaku, Thucydides. He lived there for a significant period (IIRC, he was in exile from Athens at the time) and was firsthand familiar.