Krishna's birth. The scene is Mathura, a town in northern India, adjoining
the kingdom of the Kauravas. The surrounding country is known as Braj and
its ruling families are the Yadavas. Just outside Mathura is the district
of Gokula which is inhabited by cowherds. These are on friendly terms with
the Yadavas, but are inferior to them in caste and status. The time is
some fifty years or more before the battle of Kurukshetra and the ruling
king is Ugrasena. Ugrasena's queen is Pavanarekha and a mishap to her sets
in train a series of momentous events.

One day she is taking the air in a park, when she misses her way and finds
herself alone. A demon, Drumalika, is passing and, entranced by her grace,
decides to ravish her. He takes the form of her husband, Ugrasena, and
despite Pavanarekha's protests proceeds to enjoy her. Afterwards he
assumes his true shape. Pavanarekha is dismayed but the demon tells her
that he has given her a son who will 'vanquish the nine divisions of the
earth, rule supreme and fight Krishna.' Pavanarekha tells her maids that a
monkey has been troubling her. Ten months later a son is born. He is named
Kansa and the court rejoices.

As Kansa grows up he reveals his demon's nature. He ignores his father's
words, murders children and defeats in battle King Jarasandha of
Magadha.[12] The latter gives him two daughters in marriage. He then
deposes his father, throws him into prison, assumes his powers and bans
the worship of Vishnu. As his crimes increase, he extends his conquests.
At last Earth can bear the burden no longer and appeals to the gods to
approach the supreme Deity, Brahma, to rid her of the load. Brahma as
Creator can hardly do this, but Vishnu as Preserver agrees to intervene
and plans are laid. Among the Yadava nobility are two upright persons. The
first is Devaka, the younger brother of King Ugrasena and thus an uncle to
the tyrant. The second is a certain Vasudeva. Devaka has six daughters,