Gurū Nānak (15 April 1469 – 22 September 1539; Gurmukhi: ਗੁਰੂ ਨਾਨਕ; pronunciation: [gʊɾuː naːnəkᵊ], pronunciationⓘ), also known as Bābā Nānak ('Father Nānak'),[12] was the founder of Sikhism and is the first of the ten Sikh Gurus. His birth is celebrated as Guru Nanak Gurpurab on Katak Pooranmashi ('full-moon of Kattak'), i.e. October–November.