Excerpts from Books and Wikipedia
"At its high point during the Pax Mongolica (Mongol Peace, 1206-1368 CE), the trade flourished under the protection of rulers who imposed a strong government throughout the entire Eurasian Plain." [Global Connections, p. 4] "By the late 13th century the Mongol Empire stretched from the borders of Hungary to the Sea of Japan. It consisted of four khanates: China, wealthiest and most powerful of the conquered lands was ruled by the Great Khans; central Asia was controlled by the Chagatis; Persia was ruled by the Ilkhans; and Russia was the domain of the so-called Golden Horde." [National Geographic Almanac, p. 154-8]