वाल्मीकि रामायण के अनुसार माता सीता के छोटे पुत्र कुश हुए और लव बड़े पुत्र हुए थे कुश से वर्तमान कछवाहा कुश वंश चला और लव से कूर्मवंश(कुर्मी) शाखाएं निकली

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.