Where does “Bizancio” come from?

Bizancio (Esperanto) comes from Esperanto Bizanco, from French Byzance, from Middle French Byzance, from Latin Bȳzantium, from Ancient Greek Βυζάντιον, from Ancient Greek -ῐον, from Proto-Indo-European -yós — Creates adjectives from noun or verb stems.

Ancestry of “Bizancio”, step by step

Step	Language	Word	Meaning
1	Esperanto	Bizanco	—
2	French	Byzance	opulence
3	Middle French	Byzance	—
4	Latin	Bȳzantium	—
5	Ancient Greek	Βυζάντιον	—
6	Ancient Greek	-ῐον	diminutive suffix; "suffix forming...
7	Proto-Indo-European	-yós	Creates adjectives from noun or verb stems

Every word from Proto-Indo-European -yós →Every word from Ancient Greek -ῐον →Every word from Ancient Greek Βυζάντιον →