About Kātyāyana

Kātyāyana (कात्यायन) also spelled as Katyayana was a Sanskrit grammarian, mathematician and Vedic priest who lived in ancient India.
Nyingma refuge tree - Longchen Nyingtik Lineage

Nyingma Lineage tree thangka with explanation chart

The subject depicted in this is called Guruparampara, a “Line of Teachers.” It depicts the family tree of lineage, as it were, and its function is to indicate a line of descent. The meaning of this presentation is to show a refuge for believers. It creates a kind of structure with a number of deities and teachers in whom devotees take refuge, because they will help believers in the course of their spiritual development.  .