Coin identification and denomination: Rome? 2g coin

The obverse has a bust on it, though it is quite worn.

Thanks for the help.

Not roman but byzantine coin.

On reverse (left picture):

• Large I with small cross above.
  
• In exergue, looks like TES.
  
• To left ANNO and to right a numeral; this stands for the regnal year and could help identify your coin. I can't read the numeral, there could be vau (looks the same as stigma or digamma, ϛ) and something below. ϛ=6 in this case.
  

Then, I'd say a Decanummium struck in Thessalonica; the I letter being the denomination mark here, I=10 nummi=1 decanummium.

There might be AV to end of obverse lettering at right of bust.
Perhaps Justinian I around 525-567 but hard to say without identifying obverse