Guru Angad was an Indian religious leader and the second of the ten Sikh gurus. He was born in a Hindu family, with the birth name as Lehna, in the village of Harike in northwest Indian subcontinent. Bhai Lehna grew up in a Khatri family , his father was a small scale trader, he himself worked as a pujari and religious teacher centered around goddess Durga. He met Guru Nanak, the founder of Sikhism, and became a Sikh. He served and worked with Guru Nanak for many years. Guru Nanak gave Lehna the name Angad , and chose Angad as the second Sikh Guru instead of his own sons.After the death of Guru Nanak in 1539, Guru Angad led the Sikh tradition. He is remembered in Sikhism for adopting and formalizing the Gurmukhi alphabet based on the then prevalent local Devanagari script. He began the process of collecting the hymns of Guru Nanak, contributed 62 or 63 hymns of his own. Instead of his own son, he chose a Vaishnava Hindu Amar Das as his successor and the third Guru of Sikhism. Wikipedia
Guru Granth Sahib p. 147
