Odessos - A settlement in Moesia
Odessos is one of the oldest ancient settlements in Bulgaria. It was established 585–550 BC by Miletian Greeks at the site of an existing Thracian settlement.

Odessos was a member of the Delian league of 425 BC. In 339 BC, it was unsuccessfully besieged by Philip II, and it but surrendered to Alexander the Great in 335 BC.

Shortly after 108 BC, Odessos recognized the suzerainty of Mithridates VI of Pontus. It was annexed to the province of Moesia (later Moesia Inferior) in 15 AD, and had prominent public baths, Thermae, erected in the late 2nd century AD.

In 442 AD, a peace treaty between Theodosius II and Attila was conducted at Odessos. It has also been suggested that the 681 AD peace treaty with the Byzantine Empire that established the new Bulgarian state was concluded at Varna.

Modern location: Varna, Bulgaria

(1) Gordian III | Tranquillina 238-244 AD
Obverse: AVT K M ANT ΓOPDIANOC AVΓ CE TPANKVΛ-ΛEINA: Confronted busts of Gordian on left, laureate, draped and cuirassed, and Tranquillina on right, draped and wearing stephane
Reverse: OΔHCCЄITΩN: Nemesis standing left, holding wand over wheel, and sceptre.
Ref: AMNG I, 2394; SNG Copenhagen 687; V...
(2) Odessos c. 300-100 BC
AE unit Odessos
Obverse: laureate head of Zeus right
Reverse: the great god of Odessos with causia on head, holding cornucopiae, on horseback pacing right; (HΔP), OΔHΣITΩN
Ref: AMNG 2200; Mionnet 890.