Leo I, AE4 of Constantinople, AD 457-474. 1.10 g. 

DN LEO PF AVG, pearl diademed, draped, cuirassed bust right.
No legend, lion crouching left, head left.
Mintmark CON.

RIC X 673; Sear 21461.

Sold by Gorny & Mosch, March 2015.
Estimate: 100 Euro.