Nestor of Thessaloniki was a Christian martyr and wrestler who lived in Thessaloniki during the early 4th century. He is primarily recognized as a companion to Saint Demetrius. Driven by his faith, Nestor sought the blessing of the imprisoned Demetrius to confront Lyaeus, a notorious gladiator who persecuted Christians in the arena. After successfully defeating the gladiator, Nestor faced the wrath of Emperor Maximian, who ordered his execution by his own sword.