sentence: For example , the opening introduction in The Book of Marvels to `` emperors and kings , dukes and marquises '' was lifted straight out of an Arthurian romance Rustichello had written several years earlier , and the account of the second meeting between Polo and Kublai Khan at the latter 's court is almost the same as that of the arrival of Tristan at the court of King Arthur at Camelot in that same book .
question: what _ _ opened something _ _ ?
answers: the opening introduction