The spread of spoke-wheeled chariots has been closely attributed to the Indo-European migrations from the Pontic Steppes. The earliest known chariots have been found in Sintashta culture burial sites, and the culture is considered a strong candidate for the origin of the technology, which spread throughout the Old World and played an important role in ancient warfare. These self designated Aryan people migrated southward into South Asia, ushering in the Vedic period around 1750 BC. Shortly after this, evidence of chariots appears in Asia-Minor about 1700 BC.