Vipashwi

Vipashwi; (Tib. Namparzi); Buddha Vipashwi; Buddha is credited with having sown the lotus seeds which grew into a giant jeweled lotus there. Several buddhas and bodhisattvas are said to have visited in prehistoric times including Vajradhara and Manjushri.

Source

http://www.khandro.net/stupa_Swayambhu.htm