A Christian physician of Tarsus, martyred around the year 305 at Nicaea during the empire-wide Diocletianic persecution of the early Church.

Saint Diomedes of Tarsus was a Christian physician from Tarsus in Cilicia, the birthplace of the Apostle Paul, martyred around the year 305 at Nicaea in Bithynia during the Diocletianic persecution, the most severe Roman campaign against the early Church. He belongs to a small tradition of early Christian physician-martyrs who combined medical care with open profession of faith. His veneration rests on the ancient local cult preserved through the Church’s liturgical memory.

Quick Facts

• Died: c. 305 (Nicaea in Bithynia, Turkey)
• Venerated as: Physician and lay martyr

Who Was Saint Diomedes of Tarsus?

Saint Diomedes of Tarsus was a Christian physician, a native of Tarsus in Cilicia — the birthplace of the Apostle Paul — who was martyred at Nicaea in Bithynia around 305, during the Diocletianic persecution.

Historical Setting

His death falls in the opening years of the “Great Persecution” launched by the emperor Diocletian in 303, a campaign that reached across the Roman East and touched believers of every profession, including physicians whose medical skill often served as an occasion for evangelization among their patients.

Why the Church Remembers Saint Diomedes of Tarsus

He is remembered as one of a number of early Christian physician-saints, a tradition that includes better-known figures like Cosmas and Damian, in which medical skill and Christian charity toward the sick were understood as closely joined.

Canonization and Feast Day

No formal canonisation process is recorded for Saint Diomedes of Tarsus, as is standard for a martyr of this era; his veneration rests on ancient local cult received through the Church’s liturgical memory.

What Catholics Can Learn Today

His life connects two forms of care — medicine and faith — as a reminder that ordinary professional skill can itself become a quiet vehicle for charity and witness.

A Prayer to Saint Diomedes of Tarsus

Saint Diomedes of Tarsus, physician who healed bodies and bore witness to Christ, intercede for doctors and all who care for the sick today. Amen.

Sources

• Roman Martyrology
• Butler’s Lives of the Saints