Nabonidus took an interest in Babylon's past, excavating ancient buildings and displaying his archeological discoveries in a museum. In most ancient accounts, he is depicted as a royal anomaly. Nabonidus is supposed to have worshipped the moon-god Sîn beyond all the other gods, to have paid special devotion to Sîn's temple in Harran, where his mother was a priestess, and to have neglected the Babylonian primary god, Marduk. He left the capital and travelled to conquer the desert oasis city of Tayma in north Arabia early in his reign, from which he only returned after ten years. In the meantime, his son Belshazzar ruled from Babylon.