Lord Krishna, the 10th incarnation of Lord Vishnu, took birth on earth with a purpose. The main objective of taking human form by the divine being was to rid mother Earth from the cruelties and increasing power of the demons.
Life Span of Lord Krishna
It is believed that Bhagwan Krishna lived on Earth with brother Balram for 125 years. The first ten years of his life were spent in the towns of Gokul and Vrindavan, in Northern India. The following years beginning in the 11th year of Lord's life till the age of 28 were spent in Mathura. Sri Krishna later established Dwarka, a city in Gujarat and lived the rest of his life there with his wife Rukmini and sons.
Legends of Lord Krishna's Disappearance
According to researchers, Lord Krishna disappeared on 18th February 3102 BC. The period after his disappearance marks the beginning of Kaliyug. It is said Bhagwan Krishna had predicted that exactly seven days after the disappearance of the Lord, the Golden city of Dwarka in Gujarat will drown in the sea. Indeed Dwarka city is said to have been merged in sea owing to torrential rain. There are quite a few reasons assigned to Lord Krishna's leaving his spirit for the heaven. They are as follows:
Fulfillment of Sri Krishna's Birth Objective
Lord Krishna alighted on mother Earth with the primary objective of reducing the growing power of the demons and relieving people from their cruelties. The secondary objective was fighting the historical battle in Kurukshetra in order to deliver justice to Pandavas. Having accomplished his missions and establishing peace , it was time for Lord to end his life journey on Earth.
Curse of Mother Gandhari
Mahabharata, the historical battle fought in Kurukshetra resulted in the death of all the hundred sons of King Dhritarashtra and Gandhari. Lord Krishna is said to have visited Mother Gandhari to offer his condolence. In a fit of rage and sorrow, Mata Gandhari cursed Bhagwan Krishna that just as the Kaurava dynasty had ended fighting with each other, similarly the Yaduvanshi dynasty would end fighting and killing each other. Mother Gandhari felt that Sri Krishna didn't play a fair role in putting an end to the war. Lord Krishna happily accepted the curse.
Curse of Sages Vishwamitra and Narada
According to a folklore, Sage Vishwamitra and Sage Narada once visited the city of Dwarka to meet Lord Krishna. A few children of Lord Krishna dressed up Samba (Son of Sri Krishna and Jambavati) as a pregnant woman and asked the visiting sages to foretell what kind of a child Samba will bear. Feeling insulted, the sages cursed that Samba will give birth to an Iron rod which in turn will be instrumental in the fall of the Yaduvanshi Dynasty. The very next day, Samba gave birth to an iron rod. Lord Krishna's sons crushed it into powder and threw the bottle in the sea. However, one day the bottle was washed up the shore and the powdered iron took form of an arrow. Lord Krishna could foresee everything and as a last resort to save his Dynasty, prohibited liquor in the city of Dwarka. Eventually, the Yadavas became drunk and killed each other with iron rods. None of them survived. Lord Krishna was shattered to see the Dynasty perish.
Death of Balram
On seeing the end of Yaduvanshi clan, Lord Balram the elder brother of Sri Krishna sat under a tree and ended his life by breathing out life from his mouth in the form of a white serpent.
Disappearance of Sri Krishna
Lord Krishna was disillusioned with the fraternal killing among the Yaduvanshis. He went to a forest near Somnath in Bhalka Tirth to meditate. Jara, a hunter mistook the lord's feet to be a deer and accidentally shot him with the arrow. Lord Krishna's spirit left for heaven. Bhagwan Krishna's disappearance marks the beginning of the current debauched age, also known as Kaliyug.
The great sage Vyas then wrote the famous 'Bhagawad Puran' to save the heritage and miracles of Lord Krishna. The story of Lord Krishna has since been passed from generation to generation.