It's a great coin, Charles, but I don't think Marathos was under Roman rule at that time (mid 2nd century BCE, although I think your coin is dated so you might be able to read a more specific year). I'd file this with your Greek coins.
Corinth is on the list of possible cities under "Koinon of Corinth". I prepared this before I found it on the list, so you get to see it even though we have already had a coin of Corinth. Tiberius (AD 14-37) at Corinth. 22-21 mm. Struck 32-33(?) according to RPC. Radiate head of Augustus left, legend [obscure on this coin] L ARRIO PEREGRINO II VIR Six-column temple, legend L FVRIO LABEONE II VIR COR (in exergue) RPC 1151 The legends name the two duoviri of the Roman colony Corinth. The date and place of this coin are interesting in an early Christian context, given the connection between Paul, Corinth, and the New Testament. Paul could have handled this coin.
Here's one I missed out from PROVINCIA DACIA, "Dacia, Province of" on the spreadsheet. PHILIP THE ARAB AE27. 14.42g, 27.3mm. DACIA, 'Provincia Dacia', Year 3 = AD 248/9. Varbanov 11. O: IMP M IVL PHILLIPVS AVG, laureate, draped and cuirassed bust right. R: PROVINCIA DACIA, Dacia standing left between eagle and lion, holding curved sword and standards inscribed V and XIII; AN III in exergue.
I posted this coin before on Cointalk, but I don't think it's in our list yet. It's from Claudio-Seleucia or Claudiopolis in Pisidia, and a pretty barbaric style it has. Wildwinds has only a few coins of this city, so I think I'm lucky to have it. Elagabalus, empress Julia Paula (219-220). Mint Claudio-Seleucia or Seleucia in Pisidia. Obv. bust t.r. with text IOU.K.PAVLA. Rev. Tyche with text KLA V DIOCE. 13 mm, 2.63 gr.
Thanks for the additions, Z and Pellinore! Both have been added to the list, as well as others since the last reporting. Count is now 224. Corrections and additions will be an ongoing process. Next on the repair list is to re-do all of the Peloponnesos listings. I don't like the way the list's original author handled that area.
If you are referring to Henrik Agndal's list I agree. The province for Peloponnesos is Achaea, also a region of which there were many. Like Syria, I describe these coins with three names; province, region, city.
And I was the happy winner of a certain large bronze of Valerian, issued in Elaiussa-Sebaste, which is under Sebaste in the list. Here it is. Valerian, AD 253-260. Æ30, 10.0g, 6h; CILICIA, Elaeusa-Sebaste. Obv.: AVT K Π AIK OVAΛH[ΡIANOC]; Laureate, draped bust right, from behind. Rev.: CEBACTH [IEΡAC AYT] NAYAΡX; Eagle standing right, head left. Reference: SNG Levante 855. Elaiussa-Sebaste (after the Greek) or Elaeusa-Sebaste (Latin version) was a thriving town between Vespasian and the early Byzantines. It is in Cilicia, in the middle between Seleucia Trachea (now Silifki) and Corcyros (now Kız Kalesi) on a former island with an isthmus (now sanded up). Substantial Roman remains have been left for the modern visitor. On Google Maps you may find some pictures.
I own one of from a place we have not listed before. "Galatia, Koinon of" Trajan, 98-117 AE31 mm. 22.34 grams. Sestertius-sized provincial from a rare region. Koinon of Galatia. BMC Galatia 9 hexastyle temple of Rome and Augustus at Ancyra. L&K --. Lindren III 941 (is worse). SNG Copenhagen VII plate 3 #105. A search of "Trajan Galatia" produces none on vcoins or MA-Shops as I write. A hard to find architectural type. Judging from this thread, the place must be rare. I posted it in a June 8 CoinTalk sale forum thread: https://www.cointalk.com/threads/ancient-coins.297777/#post-2763608
Hadrian, Cistophorus PHRYGIA Aezani Zeus Aezani standing Reference. RPC 3, 1390; Metcalf, Cistophori pag. 60, 49 Taf. 15, 220 ff; RIC II 497 note; RSC 275b Obv. HADRIANVS AVGVSTVS P P Bare-headed, draped, and cuirassed bust right. Rev. COS III Jupiter (Zeus Aezani) naked to waist, standing left, holding eagle and scepter. 9.20 gr 26.5 mm 6h
PONTUS, Amisus Hadrian Drachm 131-32 AD Athena standing Reference. RPC 3, 1249; SNG Copenhagen 178 Issue Year 163 (ΡΞΓ) Obv. ΑΥΤ ΚΑΙ ΤΡΑ ΑΔΡΙΑΝΟС СΕΒ Π Π ΥΠ Γ Draped and laureate bust of Hadrian, r., seen from rear. Rev. ΑΜΙСΟΥ ΕΛΕΥΘΕΡΑС ΕΤΟΥС ΡΞΓ Athena standing facing, head l., holding Nike on extended r. hand, l. resting on shield. 2.80 gr 18 mm 6h Note. Ex NAC Auktion 78, 2014, Nr. 2239.
BITHYNIA Koinon of Bithynia Hadrian AE 22 Octastyle temple Reference. RPC III, 999; RG 48 var., SNG Copenhagen 327 var. and SNG von Aulock 287 var. (one pellet in pediment). Issue I. 3 Obv. ΑΥΤ ΚΑΙС ΤΡΑΙ ΑΔΡΙΑΝΟС СΕΒ Laureate head of Hadrian, right Rev. ΚΟΙ-ΝΟΝ ΒΕΙΘΥΝΙΑС Octastyle temple on podium of two steps; 3 pellets in pediment 6.73 gr 22 mm 6h
BITHYNIA Caesarea Germanica Hadrian Ae 33 Zeus standing Reference. Very Rare RPC 3, 1026; Rec 3 Obv. ΑΥΤΟ ΤΡΑΙΑΝΟС ΑΔΡΙΑΝΟС ΚΑΙСΑΡ СΕΒ Laureate, draped, cuirassed bust right, baldric strap over shoulder and across chest, seen from front Rev. ΚΑΙΣΑΡΕΙΑΣ ΓΕΡΜΑΝΙΚΗΣ (in field), ΚΕΡ-ΣΟΝ Zeus standing facing, head l., his r. hand resting on sceptre, his l. on his hip. 23 gr 33 mm 10h
CILICIA, Germanicopolis. Hadrian Zeus standing Reference. RPC 3, 3209; SNG France 756 = Waddington 4735. Obv: ΑΥΤΟΚΡΑΤωΡ ΚΑΙСΑΡ ΑΔΡΙΑΝΟС. Laureate and cuirassed bust of Hadrian, r., with paludamentum. Rev: ΑΔΡΙΑΝΗ ΓΕΡΜΑΝΙΚΟΠ. Zeus standing left, holding patera and sceptre; to left, eagle standing left, head right, with wreath in beak. 6.17 gr 23 mm
CILICIA, Olba Hadrian Ae 20. Selene bust Reference. RPC III, 3242; Staffieri 45 Obv. ΑΥΤΟ ΚΑΙ ΘΕ ΤΡΑ ΠΑΡ ΥΙ ΑΔΡΙΑΝΟС Laureate head of Hadrian, right Rev. ΟΛΒΕΩΝ Draped bust of Selene, wearing stephane, r.; behind, crescent-moon 4.81 gr 20 mm 6h
CILICIA, Pompeiopolis (Soli) Ae 22 131-32 AD Athena standing Reference. RPC III, 3244; Boyce, pl. III, 20 Issue year 197 ZЧΡ Obv. Laureate, draped bust right. Rev. ΠΟΜΠΗΙΟΠΟΛΕΙΤωΝ Athena standing, l., holding Victory in r. hand, l. hand resting on shield; in l. field, ZЧΡ 8.63 gr 22 mm 12h
CILICIA, Zephyrion Hadrian Ae 27 Sabina Reference. RPC III, 3252; 72-75; Imhoof "Den Haag", 4; SNG Tahberer 1745-1746; LEVANTE NC 1988 S140,74(1) / COLL BERLIN / IMHOOF ZFN 1876 S343,3 LEVANTE NC 1988 S140,75(2) / HANDEL http://rpc.ashmus.ox.ac.uk/coins/3/3252/5/ Obv. ΑΔΡΙΑΝΟС СΕΒΑСΤΟС ΑΔΡΙΑΝΟΠΟΛΕΙΤωΝ laureate head of Hadrian, right. Rev. СΑΒΙΝΑ СΕΒΑСΤΗ ΖΕΦΥΡΙΩΤΩΝ Draped bust right, a triple tiara above the brow (wearing Stephan) 10.60 gr. 27 mm.