polyhistor
Someone gifted or learned to a great extent or in multiple disciplines; a great scholar.
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.
Where it comes from
From Latin polyhistor (“very learned”), from Hellenistic Ancient Greek πολυΐστωρ (poluḯstōr, “greatly learned”).
Adapted from the Wiktionary entry polyhistor (CC BY-SA 4.0).