Two Dominican monks and gifts from Pope Gregory X were carried
This man's family helped a certain empire build catapults for a siege while he was a tax collector for that empire. Following the Battle of Curzola, he was imprisoned and met Rustichello da Pisa, who wrote a book of this man's accomplishments titled Il Milione. Two Dominican monks and gifts from Pope Gregory X were carried (*) east by Maffeo and Niccolo, who were this man's uncle and father, respectively.  This man helped accompany a Mongol princess to Persia and had earlier visited China and the summer palace of Xanadu. For ten points, name this Venetian traveler who wrote about his time in the court of Kublai Khan.
This man's family helped a certain empire build catapults for a siege while he was a tax collector for that empire.
Marco Polo (prompt on “Polo” or “M. Polo”) &lt;CC&gt;  BONUSES