The history of Hinduism covers a wide variety of related religious traditions native to the Indian subcontinent. Its history overlaps or coincides with the development of religion in the Indian subcontinent since the Iron Age, with some of its traditions tracing back to prehistoric religions such as those of the Bronze Age Indus Valley Civilization. It has thus been called the “oldest religion” in the world.Scholars regard Hinduism as a synthesis of various Indian cultures and traditions, with diverse roots and no single founder. This Hindu synthesis emerged after the Vedic period, between ca. 500–200 BCE and ca. 300 CE, in the period of the Second Urbanisation and the early classical period of Hinduism, when the Epics and the first Purānas were composed. It flourished in the medieval period, with the decline of Buddhism in India.