Even in Thugga, on the edge of the Empire, the Roman fingerprint is unmistakable. I stand before a triumphal arch dedicated to Emperor Alexander Severus in AD 228. Compared to other decorative structures, this one is relatively simple. It consists of two pylons linked by single arch that spanned the ancient road linking the city to Carthage and Tébessa. Fluted pilasters reach skyward. Between them are niches, like shuttered windows.
The local name for the gate is Bab er-Roumia or "Gate of the Christian Woman." There is evidently a story here, but I don't know it.
Arches like these were iconic in the New Testament world and beyond. They were built in prominent places for honorific and propagandistic purposes.