Kusha and his younger twin brother Lava were the children of Rama and Sita. Their story is recounted in the Hindu epic, the Ramayana. Hindu traditions claim he ruled the entire region of Kashmir, Indus River and Hindu Kush as frontier lands of India known as Hindu Kush Kshetra and founded the city of Kashmir in the valley and Kasur with Lavapuri of Lava in base lands, though local lore contends Kasur was founded in 1525 by Pashtun migrants. His brother Lava is traditionally believed to have founded Lavapuri.

Lava and his elder twin brother Kusha, are the children of Rama and Sita in Hindu tradition. Their story is recounted in the Hindu epic, Ramayana and its other versions. He is said to have a whitish golden complexion like their mother, while Kusha had a blackish complexion like their father.