She arrived a year later .
The Chinese Princess Wencheng ( Tibetan : Mung - chang Kung - co ) departed China in 640 to marry Songtsen Gampo 's son .
Princess Wencheng arrived a year later .
The Chinese Princess Wencheng ( Tibetan : Mung - chang Kung - co ) departed China in 640 to marry Songtsen Gampo 's son .