Some Wikipedia quotes, convenient but more importantly tend to cite sources.
The Yoga Sutras were compiled around 400 CE by Patañjali, taking materials about yoga from older traditions. Together with his commentary they form the Pātañjalayogaśāstra.
The most recent assessment of Patañjali's date, developed in the context of the first critical edition ever made of the Yoga Sūtras and bhāṣya based on a study of the surviving original Sanskrit manuscripts of the work, is that of Philipp A. Maas. Maas's detailed evaluation of the historical evidence and past scholarship on the subject, including the opinions of the majority of Sanskrit authors who wrote in the first millennium CE, is that Patañjali's work was composed in 400 CE plus or minus 25 years.
The Haṭha Yoga Pradīpikā (Sanskrit: haṭhayōgapradīpikā, हठयोगप्रदीपिका) is a classic Sanskrit manual on hatha yoga, written by Svāmi Svātmārāma, a disciple of Swami Gorakhnath. It is among the most influential surviving texts on the hatha yoga, and is one of the three classic texts of hatha yoga, the other two being the Gheranda Samhita and the Shiva Samhita. A fourth major text, written at a later date by Srinivasabhatta Mahayogaindra, is the Hatharatnavali.
New research on the history of yoga in medieval India is throwing much new light on the origins and meaning of Haṭha Yoga.
In compiling the Hathapradīpikā it is clear that Svātmārāma drew material from many different sources on various systems of Yoga such as Yajñavalkya's and Vasistha's Aṣṭāngayoga, the Amanaskayoga's Rājayoga, the Vivekamārtaṇḍa's Ṣaḍdaṅgayoga, Ādināth's Khecarīvidyā, the Virūpākṣanātha's Amṛtasiddhi, and so on. He assembled it under the name of Haṭhayoga and, judging from the vast number of manuscripts of the Haṭhapradīpikā, its numerous commentaries, and the many references to it in late medieval Yoga texts, his Haṭhayoga grew in prominence and eclipsed many of the former Yogas. As a label for the diverse Yoga of the Haṭhapradīpikā, Haṭhayoga became a generic term. However, a more specific meaning of the term is seen in the tenth- to eleventh-century Buddhist tantric commentaries, and this meaning is confirmed by an examination of the adverbial uses of the word haṭha in the medieval Yoga texts predating the Haṭhapradīpikā. Rather than the metaphysical explanation of uniting the sun (ha) and moon (ṭha), it is more likely that the name Haṭhayoga was inspired by the meaning 'force'. The descriptions of force fully moving kundalinī, apāna, or bindu upwards through the central channel suggest that the "force" of Haṭhayoga qualifies the effects of its techniques, rather than the effort required to perform them.
The Yoga Yajnavalkya (Sanskrit: योगयाज्ञवल्क्य, yoga-yājñavalkya) is a classical treatise on yoga traditionally attributed to sage Yajnavalkya. It takes the form of a dialogue between Yajnavalkya and the renowned female philosopher Gargi. The extant Sanskrit text consists of 12 chapters and contains 504 verses. Most later yoga texts like the Hatha Yoga Pradipika, the Yoga Kundalini and Yoga Tattva Upanishads have borrowed verses almost verbatim from or make frequent references to the Yoga Yajnavalkya. In the Yoga Yajnavalkya, yoga is defined as the union between the living self (jivatma) and the supreme self (paramatma). The yogi, Tirumalai Krishnamacharya, considered Yoga Yajnavalkya to be one of the most important yoga texts and refers to this text in the introduction to his book, Yoga Makaranda (1934).
- Wikipedia ( mostly based on the introduction from AG Mohan's own edition of the text)
The corpus of Haṭhayoga texts consulted for this essay is as follows
1. These dates are merely an approximate guide, designed to facilitate the reading of this essay.
Early texts: Amṛtasiddhi of Virūpākṣa (11/12th century), Amaraughaprabodha (14/15th century), Dattātreyayogaśāstra (12/13th century), Khecarīvidyā (13/14th century), the original Gorakṣaśataka (14/15th century), Śārṅgadharapaddhati (1363 ce), Vasiṣṭhasaṃhitā (12/13th century), Vivekamārtaṇḍa (13/14th century) (including the Gorakṣapaddhati, the Gorakṣaśataka, Yogamārtaṇḍa, and one edition of the Gorakṣasaṃhitā), Yogayājñavalkya (13/14th century), Yogabīja (14/15th century).
Haṭhapradīpikā (15th century)
Late texts: 13 Gheraṇḍasaṃhitā (17/18th century ), Haṭharatnāvalī (17th century), Haṭhatattvakaumudī (18th century), Śivasaṃhitā (15th century), Yogacintāmaṇi (16/17th century), Yogatārāvalī (15/16th century).
- Dr Jason Birch 'The Meaning of Hatha Yoga' from Journal of the American Oriental Society 131.4 (2011) 527