Caracalla, AE of Dioshieron, Lydia. 22.09 g. 

AVTOKR AVR ANTWNEINOC, laureate, draped, cuirassed bust right.
EPI TATHANOY LAI DIOSIEREITWN, Septimius Severus on horseback
galloping right, holding spear, riding over a kneeling captive.

Apparently unpublished, Helios auction 5, lot 786

Courtesy of Helios Auction 5, June 2010, lot 786