Archaeologists found many clay tablets engraved with cuneiform characters, prayers and myths near the ruins of a temple in Nipur, south of Baghdad, Iraq. This is one of the earliest known library relics, which existed in the first half of the 30th century BC. Several batches of clay tablets were also found in Mesopotamia and its neighboring countries. In the 7th century BC, King Subanj of Assyria established a large royal library in Nineveh, the capital (located on the upper reaches of the Tigris River). There are about 25,000 clay tablets in the library, arranged according to different themes. There are catalogues of these clay tablets at the entrance of collection room and on the nearby walls.