Guru Nanak Sahib (the First Nanak, the founder of Sikhism) was born on 15th April, 1469 at Rai-Bhoi-di Talwandi in the present distrect of Shekhupura (Pakistan), now Nanakana Sahib. The Birthday of Guru Nanak Sahib is celebrated on 15th Kartik Puranmashi i.e. full moon day of the month Kartik. On this day the Birthday of Guru Nanak Sahib is celebrated every year. (But some other chronicals state that Guru Nanak Sahib was born on 20th October,1469) Guru Nanak's father, Mehta Kalyan Das, more popularly known as Mehta Kalu was the agent and Chief Accountant of Rai Bular. Guru Nanak 's mother was Mata Tripta, a simple, pious and extremely religious woman. Nanak had an elder sister, Nanki, who always cherished her younger brother.