Stone sign by Lago d’Averno quoting Virgil
‘There was a deep cave, gaping wide and vast, stony and protected by a black lake and lightless grove. No flying creatures could wing their way over this cave without harm, such was the vapour that poured from its murky throat and made its way to the vaulted sky above.’
Aenied: Book VI: 237-241
‘… “Away! away! unholy ones,” shouted the seer, “withdraw from all the grove…”
Aenied Book VI: 258-259