Vysogota of Corvo was a physician, surgeon, alchemist, researcher, historian, philosopher and ethicist, as well as a professor at both the Oxenfurt academy and the Imperial Academy. He was pursued and forced to flee, eventually creating a hermitage in the swamps of Pereplut.
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It was in the swamp, that the old lecturer found Ciri, close to death. He took her back to his hermitage and nursed her back to health. Eventually, after Ciri had regained her health and decided to venture back out into the world, Vysogota died alone on the floor of his hut, with a banshee screaming in the distance
The Witcher
Zoltan Chivay can mention him during a rather philosophical conversation with Geralt: "If you want a scholar's word, read Vysogota of Corvo."