These genitive cases, humi, on the ground, domi, at home, militiæ, in war, belli, in war, follow the construction of proper names, as
Parvi sunt foris arma nisi est consilium domi:
Arms are of little worth abroad unless there be wisdom at home.
Cicero must have said this with a prospective eye to Canada.
But if the name of a city or town shall be of the plural number only, or of the third declension, it is put in the ablative case, as
Aiunt centum portas Thebis fuisse:
They say there were an hundred gates at Thebes.
You needn’t believe it unless you like.
Egregia Tibure facta videnda sunt:
Fine doings are to be seen at Tivoli.