13) to the South

13) Alas much as I would like to remain in Rome, my curiosity calls me along dusty roads to the South. In the early Roman Imperial era, a huge natural disaster occured with the eruption of a volcano. a) what was/is the volcano called? b) when did this eruption occur..? c) In the mid 1700s, they first excavated the ancient city of .... (11 letters in this name of this city!)