SS Prothasius, Ambrosius, and Gervasius, in the lower register
Above the upper register and below the lower, the inscription says "Eribertus Archiepiscopus Sancta[e] Mediolanensis Ecclesiae" (Archbishop Eribertus of the Holy Church of Milan).
The figures in the lower register are labeled (left to right), "Sanctus Prothasiu[s]," "Sanctus Ambrosius," and "Sanctus Gervasius."
John and Virgin are also identified by the inscriptions to the left and right of the upper register.
