Kan(sh) the wicked king of Mathura, had imprisoned his sister Devaki and her husband Vasudeva because oracles had informed him that her child would be his killer. Every time she delivered a child, he smashed its head on the floor. He killed six children. When the seventh child was conceived, the gods intervened. They summoned the goddess Yogamaya and had her transfer the fetus from the womb of Devaki to the womb of Rohini (Vasudeva's other wife who lived with her sister Yashoda across the river Yamuna, in the village of cowherds at Gokul). Thus the child conceived in one womb was incubated in and delivered through another womb.