He was asked by Constantina, the sister of Roman Emperor Constantius II, to proclaim himself Emperor. Her brother Constans had been killed by Magnentius earlier that year and she probably thought Vetranio could protect her family and herself against the usurper. Vetranio accepted, and coins were minted in his name.
When Constantius II returned from the East to deal with the usurper, Vetranio willingly surrendered the purple to him. He was allowed to live the remainder of his years as a private citizen on a state pension.
Reverse: CONCORDIA MILITUM, Vetranio in military attire standing left, star above head, holding labarum in each hand
Die Orientation: 0 H
Weight: 4 g
No star before A, so earlier variant
Reverse: Constantius standing left, holding labarum, being crowned by Victory; HOC SIG_NO VICTOR ERIS / A / •ΓSIS?
Die Orientation: -
Weight: 3.8 g
Reverse: Constantius standing left, holding labarum, being crowned by Victory; HOC SIG_NO VICTOR ERIS / A / ·ESIS·
Die Orientation: -
Weight: 3.5 g
Reverse: Constantius standing left, holding labarum, being crowned by Victory; HOC SIG_NO VICTOR ERIS / A / •BSIS*
Die Orientation: -
Weight: 4.95 g
Reverse: CONCORDIA-MILITVM, Emperor, diademed and in military dress, standing facing, head left, holding standard with chi-rho banner in each hand, star above, III in left field. Mintmark ASIS
Die Orientation: -
Weight: 4.4 g