Gallienus, AE37 medallion of Antioch ad Maeandrum, Caria, ca. 260 AD. 21.17 gr. 

AV KA PO GALLIHNOC, Helmeted and cuirassed bust left, 
holding spear and shield.
ANTIOXE-WN, six-arched bridge with guard rails across 
the Maeander River; triple-bayed triumphal arch at one 
end; river-god Maeandros reclining left above, holding 
cornucopiae.

SNG von Aulock 8059 (AY K PO GALLIHNOC)
SNG von Aulock 2430 (AYT K P GALLIHNOC).
Very Rare.
After the defeat of Valerian I by the Persians, Gallienus regained the bridge over the Maeander River, which was very important for supplies on the eastern front.

With permission of Sergey Nechayev, Mithra Ancient Coins, Apr. 2013.