Justin Martyr (Justin the Martyr, also known as Justin of Caesarea) (100 – 165) was an early Christian apologist. His works represent the earliest surviving Christian apologies of notable size.

Most of what is known about the life of Justin Martyr comes from his own writings. He was born at Flavia Neapolis (modern Nablus) in Palestine. According to church tradition Justin suffered martyrdom at Rome under Marcus Aurelius when Rusticus was prefect of the city (between 162 and 168). He calls himself a Samaritan, but his father and grandfather were probably Greek or Roman, and he was brought up a Pagan. It seems that he had property, studied philosophy, converted to Christianity, and devoted the rest of his life to teaching what he considered the true philosophy, still wearing his philosopher's gown to indicate that he had attained the truth. He probably travelled widely and ultimately settled in Rome as a Christian teacher.

It is alleged that his relics are housed in the church of St. John the Baptist in Sacrofano, a few kilometers north to Rome.

The following works are named:

1. The First Apology addressed to Antoninus Pius, his sons, and the Roman Senate;
2. a Second Apology addressed to the Roman Senate;
3. the Discourse to the Greeks, a discussion with Greek philosophers on the character of their gods;
4. a Hortatory Address to the Greeks;
5. a treatise On the Sovereignty of God, in which he makes use of pagan authorities as well as Christian;
6. a work entitled The Psalmist;
7. a treatise in scholastic form On the Soul; and
8. the Dialogue with Trypho.

Attributes: Philosopher's coat, palm tree

Patronage: Philosophers

Prayer: