Andrea Orcagna (1308-1368)
St. Zenobius
Cathedral of Santa Maria del Fiore, Florence, Italy
The saints seated before Zenobius are Crescentius on the left and Eugenius on the right. Eugenius was Zenobius's archdeacon, his status symbolized by the censer hanging from his hands. Crescentius was a subdeacon.
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Source: this page at Wikimedia Commons.