2nd-century Christian saint mentioning Buddhism
https://www.earlychristianwritings.com/text/clement-stromata-book1.html
"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 Samanaeans among the Bactrians; 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."
"Some, too, of the Indians obey the precepts of Buddha; whom, on account of his extraordinary sanctity, they have raised to divine honours."
-St. Clement of Alexandria