[pierrem15]

I remember reading about a dig at Vienne in the late 19th century or early 20th where the archaeologists took down some medieval houses and were amazed to find a well preserved amphitheater underneath.

The locals still called the street leading there, "Rue du Theatre." Guess they missed that clue.

[jimtorr]

The locals still called the street leading there, "Rue du Theatre."

Yes. If the locals are not displaced or killed by war or plague, place names change very slowly, if at all. Sometimes local legends are true.

Another example is Paris. The city locale was the headquarters of the Parisii tribe of Gaul.