a line of prehistoricbon-posages called ‘Thirteen of the Honored Middle Lineage’ (Bar gyi gdung-rgyud bcu-gsum-mo; Bellezza 2008: 209); an ancestral maternal line known as the ‘Thirteen Grandmothers’ (Phyi-mo bcu-gsum; Bellezza 2005: 202, 203, 205). The word portal in a genealogi...