ID Helpings For 3 Coins Pls (Id: Greek Tetradrachm, 12th Century Byzantine Electrum Aspron Trachy)

Coin #2 Looks like an Electrum aspron trachy of John II (Comnenus) 1118-1143, Sear# 1941.

Coin #3 is a AV Hyperpyron of Andronicus II and Michael IX 1295-1320 Sear# 2396.Bust of the Virgin Mary within the city walls. Christ in the center with Andronicus on the left and Michael on the right.

thanks lisa and echizento.

I've checked several sources but have not being able to find an Alexander Tetradrachm with that particular marking.

Just to clarify for anyone unfamiliar with ancients: this coin (the one in the top pic and bottom two pics) isn't actually Roman, it's Greek; Alexander III is perhaps better known as Alexander the Great, king of Macedonia and conqueror of much of the ancient world.

The coinage of Alexander the Great was one of the first great "imperial" coinages, in the sense that coins of this same design were issued at dozens of mints scattered throughout the empire, with the mint and sometimes the date of issue distinguished by an astonishingly complex system of mintmarks, symbols and monograms. I'm not aware of an absolutely comprehensive website to go to for a list of mintmarks on these coins; random searching is the best one can do.

I did find this one, struck in Parion (now in northwestern Turkey) which has both the monogram (which I would interpret as "I A I") and the curious asymmetry to the ornamentation on the back of the throne. However, it also has an additional mintmark, a bull.

Here's another; this one's from Sardis, in what is now western Turkey. It isn't as close a match; it has the IAI mark but also a star, and the throne lacks any upper ornamentation.

Just to confirm: how large and/or heavy is this coin? We're all assuming it's a tetradrachm, because those are the most common coin, but it could be a smaller denomination. Some aspects of the design, such as the throne-top ornamentation, look a bit too crude for a tetradrachm.

Thanks a lot Sap
you re right, I'm correcting it now.
it is a tetradrachm, (24~26 mm I havent got a weighing machine but I guess nearly 17 g)
this coins have got same mint marks. but on my coin zeus has got a different foot position (right foot in front of left foot) and my herakles older than sardes mint's herakles.

Sap:
Thanks for the info.