Wattbiker, the inscription you show is not ancient, but an imaginative modern version of what someone imagines a Greek inscription might look like in the early 5th century BCE. What is "famous" is not an "inscription" (no such ancient inscription exists), but the quotation itself from Leonidas/Plutarch.
Spiros (above post) has given you a resource for finding an appropriate font; I would suggest "Lithos," if you can find it. Otherwise, the script you propose in your illustration would be attractive (if not entirely authentic) as a tattoo.