Great indeed is the origin
In 1271, on the advice of his Chinese minister Liu Bingzhong, Kublai took the dynastic name "Great Yuan" from the Book of Changes, "Great indeed is the origin, the source of all things" — the first time a Chinese dynasty was named not for a founding place (Han and Tang both took the names of fiefs) but for an abstract concept from a classic. A steppe conqueror’s regime deliberately grafted itself onto the narrative lineage of Central Plains legitimacy: the dynastic name itself was a political statement.
Marco Polo’s Khanbaliq
The Venetian merchant Marco Polo claimed to have served seventeen years at Kublai’s court, and the Khanbaliq (Dadu) of his account — streets straight as a chessboard, post stations reaching everywhere, paper money in use across the land — European readers refused to believe, calling the book "Il Milione," the million lies. Whether all in it is true is still debated, but this very book let Europe "see" China for the first time, and two centuries later Columbus carried a well-thumbed copy of Marco Polo’s Travels in his sailing kit.