There is evidence for the importance of female practitioners in Indian Tantric Buddhism and pre-modern Tibetan Buddhism. At least one major lineage of tantric teachings, the Shangpa Kagyu, traces itself to Indian female teachers and there have been a series of important female Tibetan teachers, such as Yeshe Tsogyal and Machig Labdrön. It seems that even though it might have been more difficult for women to become serious tantric yoginis, it was still possible for them to find lamas that would teach them high tantric practices.