Johannes. 423-425 AD. AE4 11mm. Rome mint. 

DN IOHAN-NES PF AVG, Pearl-diademed, draped and  cuirassed bust right.
SALVS REI-PVBLICAE, Victory advancing left, holding trophy over 
shoulder and dragging captive; chi-rho over Q in left field. 

Mintmark RM (off flan)

With permission of H.D. Rauch, 2002.
Sold for 310 Euros.