Roman historical accounts describe an embassy sent by the "Indian king Pandion (Pandya?), also named Porus," to Caesar Augustus around 13 CE. The embassy was travelling with a diplomatic letter in Greek, and one of its members was a sramana who burned himself alive in Athens to demonstrate his faith. The event made a sensation and was described by Nicolaus of Damascus, who met the embassy at Antioch, and related by Strabo (XV,1,73 ) and Dio Cassius (liv, 9). A tomb was made to the sramana, still visible in the time of Plutarch, which bore the mention:
By the time of Jesus, the teachings of the Buddha had already spread through much of India and penetrated into Sri Lanka, Central Asia and China. They display certain similarities to Christian moral precepts of more than five centuries later; the sanctity of life, compassion for others, rejection of violence, confession and emphasis on charity and the practice of virtue.
Will Durant, noting that the Emperor Ashoka sent missionaries, not only to elsewhere in India and to Sri Lanka, but to Syria, Egypt and Greece, speculated by Will Durant in the 1930s that they may have helped prepare the ground for Christian teaching.
Ashoka ascended the throne of India around 270 B.C.E.. After his conversion to Buddhism he dispatched missionaries to the four points of the compass. Archeological finds indicate these missions had been "favorably received" in lands to the West.
Ptolemy II Philadelphus, one of the monarchs Ashoka mentions in his edicts, is recorded by Pliny the Elder as having sent an ambassador named Dionysius to the Mauryan court at Pataliputra: "India has been treated of by several other Greek writers who resided at the courts of Indian kings, such, for instance, as Megasthenes, and by Dionysius, who was sent thither by Philadelphus, expressly for the purpose: all of whom have enlarged upon the power and vast resources of these nations."
Records from Alexandria, long a crossroads of commerce and ideas, indicate that itinerant monks from the Indian subcontinent may have influenced philosophical currents of the time. Roman accounts centuries later speak of monks traveling to the middle east, and there is mention of an embassy sent by the Indian king Pandion, or Porus (possibly Pandya), to Caesar Augustus around 13 CE. The embassy was traveling with a diplomatic letter in Greek, and one of its members was a sramana who burned himself alive in Athens to demonstrate his faith. The event caused a sensation. It was described by Nicolaus of Damascus, who met the embassy at Antioch, and by Strabo (XV,1,73 ) and Dio Cassius (liv, 9). A tomb, still visible in the time of Plutarch, bore mention of:
"ΖΑΡΜΑΝΟΧΗΓΑΣ ΙΝΔΟΣ ΑΠΟ ΒΑΡΓΟΣΗΣ"
("The sramana master from Barygaza in India")
Meanwhile, the Buddha's teachings had spread north-west, into Parthian territory. Buddhist stupa remains have been identified as distant as the Silk Road city of Merv. Soviet archeological teams in Giaur Kala, near Merv, have uncovered a Buddhist monastery, complete with huge buddharupa. Parthian nobles such as An Shih Kao are known to have adopted Buddhism and were among those responsible for its further spread towards China.
εἰσὶ δὲ τῶν Ἰνδῶν οἱ τοῖς Βούττα πειθόμενοι παραγγέλμασιν.
ὃν δι’ ὑπερβολὴν σεμνότητος ὡς θεὸν τετιμήκασι.
"Among the Indians are those philosophers also who follow the precepts of Boutta, whom they honour as a god on account of his extraordinary sanctity."
"Thus philosophy, a thing of the highest utility, flourished in antiquity among the barbarians, shedding its light over the nations. And afterwards it came to Greece. First in its ranks were the prophets of the Egyptians; and the Chaldeans among the Assyrians; and the Druids among the Gauls; and the Sramanas among the Bactrians ("Σαρμαναίοι Βάκτρων"); and the philosophers of the Celts; and the Magi of the Persians, who foretold the Saviour's birth, and came into the land of Judaea guided by a star. The Indian gymnosophists are also in the number, and the other barbarian philosophers. And of these there are two classes, some of them called Sramanas ("Σαρμάναι"), and others Brahmins ("Βραφμαναι")."
The story of the birth of the Buddha was also known: a fragment of Archelaos of Carrha (278 CE) mentions the Buddha's virgin-birth, and Saint Jerome (4th century CE) mentions the birth of the Buddha, who he says "was born from the side of a virgin". Queen Maya came to bear the Buddha after receiving a prophetic dream in which she foresaw the descent of the Bodhisattva (Buddha-to-be) from the Tuṣita heaven into her womb. This story has some parallels with the story of Jesus being conceived in connection with the visitation of the Holy Spirit to the Virgin Mary.
See main article: Buddhism and Gnosticism
Early 3rd century–4th century Christian writers such as Hippolytus and Epiphanius write about a Scythianus, who visited India around 50 CE from where he brought "the doctrine of the Two Principles". According to Cyril of Jerusalem, Scythianus' pupil Terebinthus presented himself as a "Buddha" ("He called himself Buddas" ). Terebinthus went to Palestine and Judaea ("becoming known and condemned"), and ultimately settled in Babylon, where he transmitted his teachings to Mani, thereby creating the foundation of Manichaeism:
"But Terebinthus, his disciple in this wicked error, inherited his money and books and heresy, and came to Palestine, and becoming known and condemned in Judæa he resolved to pass into Persia: but lest he should be recognised there also by his name he changed it and called himself Buddas."