ancientrome.org
Roman history is taught everywhere and served online by a mix of ageing university pages and thin content farms. Something authoritative, well illustrated and properly structured would find its audience immediately, particularly among students and teachers.
The subject is one of the most consistently popular in history: school curricula, university courses, documentaries, podcasts, games, novels, and a general readership that never diminishes.
The .org is exactly right for it. Classical studies live in universities, museums, learned societies and archaeological institutes, all of which use that extension. A teaching resource, an archive, a society, a museum project or an educational publisher would all look native here.
Two words, exact match, no hyphen, no ambiguity, and a subject with two thousand years of material and no risk of irrelevance.
Available now. Enquiries welcome.