Thessalian League Authority in Federation from Late 6th century BC to 146 BC.
The Thessalian League was a loose confederacy of feudal-like city-states and tribes in the Thessalian plain in Northern Greece. The seat of the Thessalian diet was Larissa.

At the end of Second Macedonian War in 196, Rome established Thessaly as a koinon, Federal League, and cultivated its development to make it part of hegemonic powers of central and northern Greece. Under Roman control, the Thessalian League gradually increased in size and power as a loyal ally and it played a significant role in the campaigning and theatre of operation during the Roman civil wars.
Thessalian League
An AE unit struck c. 150-100 BC in Thessaly
Obverse: head of Apollo right

Reverse: Athena Itonia right throwing spear holding shield; ΘEΣΣA / ΛΩN, ΦIΛOK, A / Σ _ OP, (ΓA)

Diameter: 18 mm
Die Orientation: -
Weight: 6.68 g
Philok.. and Asor.. magistrates
Rogers 21; Sear #2238; Lindgren II 1413
An AR Stater struck 47-46 BC in Thessaly
Obverse: Head of Zeus right, wearing laurel wreath; [I]TAΛO[Σ] behind

Reverse: Athena Itonia advancing right; [Δ]IO-KΛHΣ above spear, N-I in inner fields

Diameter: -
Die Orientation: -
Weight: 6.26 g
No notes for this coin
McClean 4797-8; SNG Copenhagen 277
An AR Drachm struck 130 - 100 BC in Thessaly
Obverse: Laureate head of Apollo right; HP monogram behind

Reverse: Athena Itonia right; Π-I across central field

Diameter: 17.5 mm
Die Orientation: 7 H
Weight: 4.14 g
Her-|Pi- (Magistrates)
BCD Thessaly 889.3 (this coin)
An AE unit struck c. 150-100 BC in Larissa (Thessaly)
Obverse: laureate head of Zeus right

Reverse: Athena Itonia advancing right holding spear and shield; ΘEΣΣA_ΛΩN

Diameter: 15 mm
Die Orientation: -
Weight: 3.6 g
No notes for this coin
Cf. BCD Thessaly II, 910.1-6; Rogers 52-54.