The Revelation of the Magi, reputedly a first-hand account of their journey to pay tribute to the son of God,...
It is an eighth-century copy of a story first written down nearly half a millennium earlier, less than 100 years after the Gospel of Matthew, the original source of the Bible story.
8th century, is in the nine hundreds. "Half a millenium earlier" is in the four hundreds. The event itself was a handful of years into BC.
What we have here is Christian folklore from four centuries after the fact. Interesting in and of itself, but doesn't necessarily tell us much that's accurate about the event itself. Matthew's very spare account would be more reliable, even if it wasn't inspired scripture.
Eighth century would have been the 701-800 (20th Century - 1901-2000). “Half a millenium earlier” would have been 201-300.