Three ancestral religious kings
The three ancestral religious kings (Tib. མེས་དབོན་རྣམ་གསུམ་, mé wön nam sum, Wyl. mes dbon rnam gsum) — the most famous of Tibet's ancient kings, who made the greatest contribution to establishing the teachings of the Buddha in Tibet.
They are said to have been emanations of the Lords of the Three Families.