The fact that Socotra was inhabited by Indians, Arabs, and Greeks and engaged in international trade between the Red Sea and the Indian Ocean is recorded in the 1st century book, Periplus of the Erythraean Sea. Graffiti written in Indian, Southern Arabic, Ethiopian, Greek, Palmyranian languages were found in Hoq Cave, discovered in 2000. As a result of analyzing the written period of these graffiti, it was revealed that they were written from the 2nd century BC to the 6th century AD, and the contents of Periplus were confirmed. It can be confirmed that Christianity was introduced in Socotra, where international trade was actively conducted, in the late 4th century or at the latest at the 6th century. The earliest person who spreads the Christianity is Theophilus, who was sent to the Kingdom of Himyarite by Emperor Constantius in 354 AD to embrace Christianity. It is likely that he brought Christianity to his hometown of Socotra after building three churches with the permission of King Himyarite. In 525, Aksum conquered the Kingdom of Himyarite and converted to Christianity. Since Socotra was under Himyarite Kingdom's rule at this time, the gospel must have been preached through the Aksumites. Third, Cosmas's Christian Topography records that there were bishops appointed from Persia and Christians on the island of Socotra. It can be seen that Persian Christianity was witnessed in Socotra, given that folk-shaped Nestorian crosses were found in Dahaisi and SHP_067 in Socotra. Therefore, it can be seen that international trade from the Roman Empire to the Indian Ocean was actively carried out in Socotra in ancient times, and Christianity was also spread through such exchanges.