Hanbok went through significant changes under Mongol rule. After the Goryeo dynasty signed a peace treaty with the Mongol Empire in the 13th century, Mongolian princesses who married into the Korean royal house brought with them Mongolian fashion which began to prevail in both formal and private life. A total of seven women from the Yuan imperial family were married to the Kings of Goryeo. The Yuan dynasty princess followed the Mongol lifestyle who was instructed to not abandon the Yuan traditions in regards to clothings and precedents. As a consequence, the clothing of Yuan was worn in the Goryeo court and impacted the clothing worn by the upper class families who visited the Goryeo court. The Yuan clothing culture which influenced the upper classes and in some extent the general public is called "Mongolpung". King Chungryeol, who was political hostage to the Yuan dynasty and pro-Yuan, married the princess of Yuan announcing a royal edict to change into Mongol clothing. After the fall of the Yuan dynasty, only Mongol clothing which were beneficial and suitable to Goryeo culture were maintained while the others disappeared. As a result of the Mongol influence, the "chima" skirt was shortened, and "jeogori" was hiked up above the waist and tied at the chest with a long, wide ribbon, the "goruem" (an extending ribbon tied on the right side) instead of the "twii" (i.e. the early sash-like belt) and the sleeves were curved slightly.