Polycarp of Smyrna was a prominent early Christian bishop and martyr, believed to have lived from around 69 to 155 AD. He served as the bishop of Smyrna, a city in modern-day Turkey, and is known for his strong defense of Christian teachings against heresies. His life is documented in the "Martyrdom of Polycarp," which recounts his steadfast faith and refusal to renounce Christianity. Polycarp was a disciple of John the Apostle, which highlights his connection to the early church. He is celebrated for his role in the development of Christian doctrine and is recognized as a saint in various Christian traditions. His martyrdom is commemorated on February 23rd each year.