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… Fires; and abounds with sulphureous and combustible Earth and Materials; which no doubt tend to it fructification. To begin with the Phlegraean fields. Concerning which, Here first, what Mr. Sandys, in his Travels, sayes. Vulcan’s Court described. The Court of Vulcan, call’d the Phlegraen fields heretofore; for that Hercules here overthrew the Gyants, for…
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/chapter5.php