Hatha Yoga Pradeepika-Introduction

refer:
http://yog-knowledge.blogspot.com/2010/12/hatha-yoga-pradeepika-ch-1-po-1_26.html

Hatha Yoga Pradeepika begins with Salutation to Âdinâtha (Śiva) who expounded the knowledge of Haṭha Yoga, which like a staircase leads the aspirant to the high pinnacled Râja Yoga. Yogin Swâtmârâma, after saluting first his Gurû Srinâtha explains Haṭha Yoga for the attainment of Raja Yoga.Yogî Swâtmârâma discloses that he learned Hatha Vidhya from Matsyendra, Gorakṣa, etc., who knew Haṭha Vidyâ.

details here:

http://yog-knowledge.blogspot.com/2010/12/hatha-yoga-pradeepika-ch-1-po-1_26.html