This is a representation of the coat of arms of the Roman Catholic Diocese of Marquette.Blazon: Gules two keys palewise wards outwards between two stag's attires Argent on a chief of the same two fleur-de-lys between three passion nails of the first. 
The following Commons images were used to create this image:

 File:Roman Catholic Diocese of Erie.svg by Niagara (talk · contribs) (mitre)
 File:Old French Escutcheon.svg by Masur (talk · contribs)
 File:Wittlich Wappen.svg by SanchoPanzaXXI (talk · contribs)
 File:Blason Linthal.svg by Gretaz (talk · contribs)
 File:Glattfelden-blazon.svg by Gerhard Bräunlich (talk · contribs)
Own work
Alekjds