630 to a spring at Squillace, close by the Vivarium, the monastery founded in the previous century by Cassiodorus in the heel of Italy.

A relic of his arm was brought to Guardavalle in 1584 by the bishop of Squillace, Marcello Sirleto, hence Agathius' patronage of this city.

Relics from Squillace were also brought to Cuenca and Ávila in Spain, where he is known as San Acato.

[7] For the same reason he became popular among the Maniots, inhabitants of the Mani Peninsula in Greece, who took up his confrontation of the Pagan Roman authorities as a symbol of their own long lasting resistance of the Ottoman Empire's rule.

St. Achatius is one of the Fourteen Holy Helpers or Auxiliary Saints in Roman Catholic tradition.