Definition of "polyhistor"

A hired diplomat in Edirne and to the Porte in Constantinople, a military commander in the Austro-Turkish wars, a polyhistor and a learned man.

1988, Milorad Pavić, translated by Christina Pribićević-Zorić, Dictionary of the Khazars, Vintage, published 1989, page 24

[Carlfriedrich] Claus is an artist, though he does not like to call himself one, and a scholar. As such, he personifies the polyhistor, a species rarely found today.

1997, Eckhart Gillen, quoting Henry Schumann, German Art from Beckmann to Richter, page 289