Tegulus is venerated as a member of the legendary Theban Legion, whose members were led by Maurice in the 3rd century. The center of Tegulus' cult is at Ivrea. Veneration of Tegulus actually arose at the end of the 10th century, when during the episcopate of Warmondus (Varmondo), the Tegulus's relics were discovered in a sepulcher situated a short distance away from Ivrea. The relics were translated to the cathedral of Ivrea within the city walls, and placed in the chapel of San Giacomo. The relics were later translated, with those of Bessus, to the chapel of Santissimo Sacramento.

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