Kalighat painting is a school of painting in Kalighat, a small district in Calcutta. It is named after the celebrated Hindu goddess Kali. Kalighat painting originated from the folk art tradition of rural Bengal. The Patuas or picture makers had migrated from Bengal in the early nineteenth century. There are a range of subjects from religious imagery of Hindu gods, goddesses and stories to natural history, social types and proverbs. Sita was forced to prove her purity after her abduction by Ravana and subsequent rescue by Rama. Though Sita proved her innocence and Rama believed her, she was banished by his people to the forest whereupon she retreated and gave birth to twin sons, Kusa and Lava. Many years later Rama went to the forest to perform a horse sacrifice, the horse bolted and was captured by Kusa and Lava.