Where does “tetrarchia” come from?

tetrarchia (Italian) comes from Italian tetra-, from Ancient Greek τέτταρες, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

tetrarchia (Italian): tetrarchy

Definitions

Step	Language	Word	Meaning
1	Italian	tetra-	tetra-
2	Ancient Greek	τέτταρες	four
3	Proto-Indo-European	kʷetwóres	four
4	Proto-Indo-European	kʷe-	and

tetrarchia — Etymology, Origin & Word History | Etymology Explorer