Who was called didymus?

Didymus, meaning "twin" in Greek, is a name often associated with Thomas, one of Jesus' apostles, in the New Testament. He is commonly referred to as "Doubting Thomas" due to his initial skepticism about Jesus' resurrection until he saw Christ's wounds. The name reflects his dual identity as both a believer and a doubter. In some contexts, Didymus may also refer to Didymus the Blind, an early Christian theologian and biblical scholar.