https://www.independent.co.uk/news/science/archaeology/pope-palace-rome-secret-reveal-b2747785.html
Careless...
Moved back home when they no longer needed the defensive wall :)
I imagine this is a big problem when building in Rome. I mean, practically anywhere you put a spade in the ground, you are bound to hit the foundations of something from a previous age.
:-\
Inconsiderate builders...