 Following the Persian conquest of Babylon in 539 BC, the Cyrus Cylinder mentions repatriating the people and restoring the sanctuary of the god of Der, among other cities.While it appears that no excavation has occurred at Der, several notable objects have been discovered nearby, including a kudurru (discovered in Sippar) which confirmed the name of the site.The site itself has been heavily damaged by water over the centuries and was considered not worth excavating.