Arae Flaviae (mod. Rottweil), on the Neckar. In ce 74 the Roman Rhine–Danube frontier was shortened by carrying a road south-eastwards from Strasburg (*Argentorate) to the *Danube. A fort was built at the point where another road coming up from Vindonissa joined it. At the same time a civilian settlement, ‘The Flavian Altars’, was developed as a centre of the imperial cult devoted to the ruling dynasty (see ruler-cult).