Cosmas Indicopleustes
From Wiki @ Karl Jones dot com
Cosmas Indicopleustes (Greek Κοσμᾶς Ἰνδικοπλεύστης, literally "Cosmas who sailed to India"; also known as Cosmas the Monk) was an Alexandrian merchant and later hermit.
Biography
He was a 6th-century traveller, who made several voyages to India during the reign of emperor Justinian.
His work Christian Topography contained some of the earliest and most famous world maps.
Cosmas was a pupil of the East Syrian Patriarch Aba I and was himself a follower of the Church of the East.