The Four Menmo (Tib. Menmo Shyi)  are female protector deities of Tibet, bound under oath by Guru Padmasambhava. They are:-
Kongtsün Demo - Dorje Bö Kham Kyong
Tsenla Rölpe - Dorje Menchikma
Turquoise Bell - Dorje Zulema
Mentsün Ugchö - Dorje Yarmo Sil
- * The notes on Lamrim Yeshe Nyingpo, ‘Entering the Path of Wisdom’, by Jamyang Drakpa, as recorded by Jokhyab Rinpoche, from Lamrim Yeshe Nyingpo, Vol. 2, published by Rangjung Yeshe Publications, ISBN 962-7341-33-9, page205. Original source mentioned in the notes is Ratna Linpa’s Tukdrub Yangdü.
- Padmasambhava and Jamgön Kongtrul, Lamrim Yeshe Nyingpo, Vol. 2, published by Rangjung Yeshe Publications, ISBN 962-7341-33-9, pp.134 & 205.