Pseudo-Dorotheus who wrote in the late fourth or early fifth century writes in his Seventy Disciples of the Lord — ‘Thomas the Apostle having preached the Gospel to the Parthians, Medes, Persians, Germans {or Carmanians], Bactrians and Magians, suffered martyrdom at Calamine, a city of India so named’.

Pseudo-Hippolytus who wrote in the fourth or fifth century writes in his On the Apostles and Disciples — ‘And Thomas preached to the Parthians, Medes, Persians, Hyrcanians, Bactrians, and Margians, and was thrust through in the four members of his body with a pine spears at Calamene, the city of India, and was buried there.’

In the sixth century, St. Gregory of Tours writes in his Glory of the Martyrs that Theodore, a merchant, visited the tomb of St. Thomas in India and found a monastery and a church around it, and told him this information. In fact, the editor and translator of the aforementioned work of Gregory note that Gregory’s source was indeed independent and that he didn’t know of the Acts of Thomas.

Short accounts of St. Sophronius who lived in the sixth century have been found in some manuscripts of St. Jerome’s De Viris Illustr, and Sophronius states — ‘Thomas the Apostle, as has been handed down to us, preached the gospel of the Lord to the Parthians, Medes, Persians, Carmanians, Hyrcanians, Bactrians, and the Magi. He fell asleep in the city of Calamina of India.’

St. Isidiore of Seville of the sixth century writes — ‘This St. Thomas preached the Gospel of Christ to the Parthians, the Medes, the Persians, the Hyrcanians and the Bactrians, and to the Indians of the Oriental region and penetrating the innermost regions and sealing his preaching by his passion he died transfixed with a lance at Calamina...a city of India, and there was buried with honour.’

In the eight century, Pseudo-Epiphanius writes — ‘Thomas the apostle, according to tradition, was from the city of Paneas in Galilee and preached the gospel of the Lord to the Parthians, the Medes, the peoples of Persia, Carmania, Hyrkania, India, Bactria and Margiana. He fell asleep after his martyrdom in the Indian city of Calamine, where he was gloriously buried.’

Bar Hebraeus, a notable thirteenth-century Syriac Christian bishop who died before Marco Polo came to India writes — ‘Thomas preached to the Parthians, the Medes, and at Calamina, a town of India, was crowned with martyrdom, whence his body was removed to Edessa’.

Mar Solomon, the Nestorian bishop of Bassera writes — ‘Thomas was from Jerusalem of the tribe of Judah. He taught the Persians, Medes, and the Indians; and because he baptized the daughter of the King of the Indians he stabbed him with a spear and died. Habban the merchant brought his body and laid it in Edessa, the blessed city of our Lord. Others say that he was buried in Mahluph a city in the land of the Indians.’

Finally, an anonymous work, published along with the works of Oecumenius states — ‘Thomas the Apostle, as the tradition of our elders discloses, preached the Gospel of Christ to the Parthians and Medes, the Persians and Germans [or Carmanians], the Hyrcanians and Bactrians: he fell asleep in the city of Καλαμινη — Calamina, India.’

https://www.google.co.in/books/edition/Glory_of_the_Martyrs/YDMPv5F_ILoC?hl=en&gbpv=1&pg=PA51&printsec=frontcover

https://www.newadvent.org/fathers/0524.htm (Pseudo-Hippolytus).

India and the Apostle Thomas by Bishop A. E. Medlycott, pp. 151-152. — https://archive.org/details/indiaandapostle00unkngoog/page/n196/mode/2up?view=theater (Sophronius, Dorotheus, Bar Hebraeus, and Anonymous).

Identification of Calamina — https://archive.org/details/in.ernet.dli.2015.277112/page/n149/mode/2up?view=theater — St. Thomas the Apostle in India by F. A. D’Cruz, pp. 104-106.

https://www.google.co.in/books/edition/The_Acts_of_the_Apostle_Thomas/z3VvDwAAQBAJ?hl=en&gbpv=1&pg=PA110&printsec=frontcover