Guru Amar Das integral part of Sikhism. He is also remembered as the innovator who began the collection of hymns now known as "Goindwal Pothi" or "Mohan Pothi", the precursor to what became the "Adi Granth" – the first edition of Sikh scripture – under the fifth Sikh Master, which finally emerged as the "Guru Granth Sahib" under the tenth Sikh Master. The nearly 900 hymns composed by Guru Amar Das constitute the third largest part, or about 15%, of the "Guru Granth Sahib". Guru Amar Das Guru Amar Das (; 5 May 1479 – 1 September 1574) was the third of the
Adi Shankara ("Bhāṣya"), original philosophical expositions ("Prakaraṇa grantha") and poetry ("Stotra"). However most of these are not authentic works of Adi Shankara and are likely to be works of his admirers or scholars whose name was also Shankaracharya. Piantelli has published a complete list of works attributed to Adi Sankara, along with issues of authenticity for most. Adi Shankara is most known for his systematic reviews and commentaries ("Bhasyas") on ancient Indian texts. Shankara's masterpiece of commentary is the "Brahmasutrabhasya" (literally, commentary on Brahma Sutra), a fundamental text of the Vedanta school of Hinduism. His commentaries on ten Mukhya (principal) Upanishads are