So, Zur, and Nub

So, Zur, and Nub (Tib. སོ་ཟུར་གནུབས་གསུམ་, so zur nub sum; Wyl. so zur gnubs gsum) are the family or clan names of three great masters of the Nyingma School who were the early holders of the Nyingma lineage of Kama . Their names are So Yeshe Wangchuk, Zur Shakya Jungne, and Nubchen Sangye Yeshe.