Career
He stayed around 15 years among the Mongols, and only returned from Iran in 1274. The embassy arrived on 5 July 1274. David was accompanied by the clerk Rychaldus, in the service of the Mongols, and 14 Mongol dignitaries.
David of Ashby wrote a book Les fais des Tatars ("The facts about the Tartars") describing the culture of the Tatars and their remarkable military organization and discipline.
