Iron slave collar, Roman, fourth-sixth century CE The inscription says "I have run away; hold me. When you shall have returned me to my master, Zoninus, you will receive a gold coin". This was sealed around the slave's neck so there was no way to take it off.
Rome is another HBO show that never really got to hit its stride before it was cancelled. While not my favorite era, its costuming was luxe and Polly Walker's Atia, in particular, always had striking palettes that reflected her personality and status.