The known Indian designs for the Chaityas only start from circa 250 BCE with the Lomas Rishi caves in the Barabar caves group, and therefore postdate the Xanthos barrel-vaulted tombs by at least one century. The Achaemenids occupied the northwestern parts of India from circa 515 BCE to 323 BCE following the Achaemenid conquest of the Indus Valley, before they were replaced with the Indian campaign of Alexander the Great and subsequent Hellenistic influence in the region.