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…for a well-furnish’d Treasury; as being able of it self, without charge of the State, to cloath, maintain and furnish the greatest Army, with Leather, Corn, and Apparel. And if Diodorus Siculur may be credited in it, he tells us, that about Leontium, now Lentini, and some other places, Wheat did grow of it self without any labour of the Husbandman. …
https://www.wichita.edu/academics/fairmount_las/geology/wparcell/Kircher/volcanoes/chapter6.php