Theomnestus and Apollodorus Against Neaera (75)

But when Theseus settled the people in one city and established the democracy, and the city became populous, the people none the less continued to elect the king as before, choosing him from among those most distinguished by valor; and they established a law that his wife should be of Athenian birth, and that he should marry a virgin who had never known another man, to the end that after the custom of our fathers the sacred rites that none may name may be celebrated on the city’s behalf, and that the approved sacrifices may be made to the gods as piety demands, without omission or innovation.