Libius Severus. 461-465 AD. AV Tremissis. Rome mint. 

DN LIB SEVE-RVS PF AVG, rosette-diademed, draped and cuirassed bust right.
No legend, cross within wreath.  

Mintmark COMOB.

RIC X 2709

Sold for 3,500 Euros in 2008.