Thomas the Apostle (Θωμᾶς, Syriac ܬܐܘܡܐ, Tʾōmā, meaning "the twin"), also known as Didymus (Greek: Δίδυμος Didymos, meaning "twin"), was one of the Twelve Apostles of Jesus according to the New Testament. Thomas is commonly known as "Doubting Thomas" because he initially doubted the resurrection of Jesus Christ when he was told of it (as is related in the Gospel of John); he later confessed his faith ("My lord and my God") on seeing the wounds left over from the crucifixion.
According to traditional accounts of the Saint Thomas Christians of modern-day states of Tamil Nadu and Kerala in India, Saint Thomas travelled outside the Roman Empire to preach the Gospel, travelling as far as the Tamilakam which is in South India,Tamil Nadu, India and reached Muziris of Tamilakam (modern-day North Paravur and Kodungalloor in Kerala State, India) in AD 52. In 1258, some of the relics were brought to Ortona, in Abruzzo, Italy, where they have been held in the Church of Saint Thomas the Apostle. He is regarded as the patron saint of India among its Christian adherents, and the Feast of Saint Thomas on July 3 is celebrated as Indian Christians' Day. The name Thomas remains quite popular among the Saint Thomas Christians of the Indian subcontinent.
Many churches in the Middle East and southern Asia, besides India, also mention Apostle Thomas in their historical traditions as being the first evangelist to establish those churches, the Assyrian Church of the East, the early church of Sri Lanka.
Thomas first speaks in the Gospel of John. In John 11:16, when Lazarus has recently died, and the apostles do not wish to go back to Judea, Thomas says: "Let us also go, that we may die with him."
Thomas speaks again in John 14:5. There, Jesus had just explained that he was going away to prepare a heavenly home for his followers, and that one day they would join him there.