Mesopotamian collections were greatly augmented by excavations in southern Iraq after the First World War. From Tell al-Ubaid came the bronze furnishings of a Sumerian temple, including life-sized lions and a panel featuring the lion-headed eagle Indugud found by H. R. Hall in 1919–24. Woolley went on to excavate Ur between 1922 and 1934, discovering the 'Royal Cemeteries' of the 3rd millennium BC. Some of the masterpieces include the 'Standard of Ur', the 'Ram in a Thicket', the 'Royal Game of Ur', and two bull-headed lyres. The department also has three diorite statues of the ruler Gudea from the ancient state of Lagash and a series of limestone kudurru or boundary stones from different locations across ancient Mesopotamia. Although the collections centre on Mesopotamia, most of the surrounding areas are well represented. The Achaemenid collection was enhanced with the addition of the Oxus Treasure in 1897 and objects excavated by the German scholar Ernst Herzfeld and the Hungarian-British explorer Sir Aurel Stein. Reliefs and sculptures from the site of Persepolis were donated by Sir Gore Ouseley in 1825 and the 5th Earl of Aberdeen in 1861. Moreover, the museum has been able to acquire one of the greatest assemblages of Achaemenid silverware in the world. The later Sasanian Empire is also well represented by ornate silver plates and cups, many representing ruling monarchs hunting lions and deer. Phoenician antiquities come from across the region, but the Tharros collection from Sardinia and the large number of Phoenician stelae from Carthage are outstanding. Another often overlooked highlight is Yemeni antiquities, the finest collection outside that country. Furthermore, the museum has a representative collection of Dilmun and Parthian material excavated from various burial mounds at the ancient sites of A'ali and Shakhura in Bahrain. From the modern state of Syria come almost forty funerary busts from Palmyra and a group of stone reliefs from the excavations of Max von Oppenheim at Tell Halaf that was purchased in 1920. More material followed from the excavations of Max Mallowan at Chagar Bazar and Tell Brak in 1935–1938 and from Woolley at Alalakh in the years just before and after the Second World War. Mallowan returned with his wife Agatha Christie to carry out further digs at Nimrud in the postwar period which secured many important artefacts for the museum. The collection of Palestinian material was strengthened by the work of Kathleen Kenyon at Jericho in