Constantine I - Commemorative posthumous issue. Minted in AntiochSize: 16mm Weight: 1.72 grams Obverse: DV CONSTANTINVS PT AVGG Veiled head of Constantine right Reverse: veiled and togate, driving quadriga to right, extending his right hand toward God (Manus Dei) above and holding reins...

Constantine I - Commemorative posthumous issue. Minted in AntiochSize: 15mm Weight: 1.54 grams Obverse: DV CONSTANTINVS PT AVGG Veiled head of Constantine right Reverse: veiled and togate, driving quadriga to right, extending his right hand toward God (Manus Dei) above and holding reins...

Marcus Aurelius silver denarius.Minted: RomeSize: 17mm Weight: 2.72 gramsObverse: DIVVS M ANTONINVS PIVS Bare head rightReverse: CONSECRATIO Eagle standing right on thunderbolt, head left

You are buying all 18 coins. They range in size from 13-16mm.

Caracalla (211-217 AD) Minted: Nicaea, Bithynia Size: 28.5mm Weight: 12.7 grams Obverse: ANTΩNINOC AYΓOYCTOC, laureate head right Reverse: NIKAIEΩN, Tyche standing left, holding rudder and cornucopiae 

Greek coin from Pergamon Size: 16mm Weight: 2.52 grams Obverse: No legend helmeted head of Athena right Reverse: AΘHNAΣ NIKEΦOΡOY above and beneath owl standing facing on thunderbolt, wings spread 

Greek coin from Pergamon Size: 15mm Weight: 3.28 grams Obverse: No legend helmeted head of Athena right Reverse: AΘHNAΣ NIKEΦOΡOY above and beneath owl standing facing on palm branch, wings spread. ΣΑΣ-AP across fields

Caligula Size: 15mm Weight: 3.99 grams Obverse: ΓAIOΣ KAICAΡ, bare head rightReverse: ΦΙΛΟΚΑΙCAP ΦΙΛΑΔΕΛΦΕΙΩΝ [...] Capricorn with cornucopia left

Kings of Macedon - Alexander III Lampsakos MintAR silver drachm Weight:  4.09 grams Size: 15mm Obverse: Head of Herakles right, wearing lion's skinReverse:  AΛΕΞΑΝΔΡΟΥ, Zeus Aëtophoros seated left, holding sceptre; In left field, forepart of Pegasos left; monogram below throne.

Constantine I Mint: TreveriSize: 20.5mm Weight: 3.1 grams Obverse: IMP CONSTANTINVS AVG laureate draped & cuirassed bust right Reverse: SOLI INVICTO COMITI Sol standing left with hand up in salute & globe.  T-F across fields. ATR in exergue

Constantine I Mint: TreveriSize: 20.5mm Weight: 2.9 grams Obverse: IMP CONSTANTINVS AVG laureate draped & cuirassed bust right Reverse: SOLI INVICTO COMITI Sol standing left with hand up in salute & globe.  T-F across fields. BTR in exergue

Roman Emperor Augustus 27 BC-14 AD Weight: 8.7 grams Size: 29mm Obverse: DIVVS AVGVSTVS PATER, radiate head leftReverse: S-C either side of large altar, PROVIDENT in exReference: RIC 81[tib] Sear 1789