Dorotheus I of Thessaloniki

Saint Dorotheus I of Thessaloniki, a hierarch, was Archbishop of Thessalonica at the beginning of the 6th century and is venerated as a saint. He took the see sometime after 497, when Andrew was still archbishop. In March 515, as Archbishop of Thessalonica and papal vicar in Eastern Illyricum, he wrote to the newly elected pope Hormisdas about ending the Acacian schism.

The negotiations did not succeed and caused great unrest in Thessalonica against the papal envoys. The pope demanded Dorotheus's resignation, and further letters passed between them in 520. After that year Dorotheus died and was succeeded by Aristides. During his time as archbishop the venerable David the Hermit lived his ascetic life in Thessalonica. The sources consulted give no day of commemoration.