Another question asks about the differentiation between the words "chanukiyah" and "menorah" when referring to the special 8-branched (+1) candelabra for Chanukah. An answer there suggests:
All of the rest of their references to the Chanukah lights indeed use the term נר(ות) חנוכה. I'd guess that indeed the average person in those days didn't have a specially-designed candelabra for this purpose (or if they did, it wasn't branched like the original menorah)...
This seems plausible; I can't recall seeing older writings that refer to a special device, just references to lights. So my question is: How old is the chanukiyah, meaning a special candelabra that we use only for Chanukah and that has the correct number of wicks/candles? I'm interested in any evidence, whether from halachic literature, art, or known artifacts.