 Complete the following phrase:  Polo, a 13th-century merchant from the Republic of Venice, describes his travels to Yuan-dynasty China and the court of Mongol ruler Kublai Khan, along with the preceding journeys made by Niccolò and Maffeo Polo, his father and uncle, respectively, in his Travels of Marco Polo. Polo related this account to Rustichello da Pisa around 1298 while they shared a Genoese prison cell following their 