Leonard Woolley in the context of "Bull Headed Lyre of Ur"

The Ubaid period (c. 5500–3700 BC) is a prehistoric period of Mesopotamia. The name derives from Tell al-'Ubaid where the earliest large excavation of Ubaid period material was conducted initially in 1919 by Henry Hall, Leonard Woolley in 1922–1923, and later by Pinhas Delougaz in 1937. Excavations continue into the present day.

In Southern Mesopotamia, this period marks the earliest known human settlements on the alluvial plain, although it is likely earlier periods exist that are obscured under the alluvium. In the south it has a very long duration between about 5500 and 3800 BC when it is replaced by the Uruk period.

The Ziggurat (or Great Ziggurat) of Ur (Sumerian: 𒂍𒋼𒅎𒅍 é-temen-ní-gùru "Etemenniguru", meaning "house whose foundation creates terror") is a Neo-Sumerian ziggurat in what was the city of Ur near Nasiriyah, in present-day Dhi Qar Province, Iraq. The structure was built during the Early Bronze Age (21st century BC) by King Ur-Nammu of the Third Dynasty of Ur. It had crumbled to ruins by the 6th century BC of the Neo-Babylonian period, when it was restored by King Nabonidus.

Its remains were excavated in the 1920s and 1930s by international teams led by Sir Leonard Woolley. Under Saddam Hussein in the 1980s, they were encased by a partial reconstruction of the façade and the monumental staircase. The Ziggurat of Ur is the best-preserved of those known from Mesopotamia, besides the ziggurat of Dur Untash (Chogha Zanbil). It is one of three well-preserved structures of the Neo-Sumerian city of Ur, along with the Royal Mausolea and the Palace of Ur-Nammu (the E-hursag).

The Royal Cemetery at Ur is an archaeological site in modern-day Dhi Qar Governorate in southern Iraq. The initial excavations at Ur took place between 1922 and 1934 under the direction of Leonard Woolley in association with the British Museum and the University of Pennsylvania Museum of Archaeology and Anthropology in Philadelphia, Pennsylvania, United States.

Many finds are now in museums, especially the Iraq Museum, Baghdad and the British Museum.

The Halaf culture is a prehistoric period which lasted between about 6100 BC and 5100 BC. The period is a continuous development out of the earlier Pottery Neolithic and is located primarily in the fertile valley of the Khabur River (Nahr al-Khabur), of south-eastern Turkey, Syria, and northern Iraq, although Halaf-influenced material is found throughout Greater Mesopotamia.

While the period is named after the site of Tell Halaf in north Syria, excavated by Max von Oppenheim between 1911 and 1927, the earliest Halaf period material was excavated by John Garstang in 1908 at the site of Sakce Gözü. Small amounts of Halaf material were also excavated in 1913 by Leonard Woolley at Carchemish, on the Turkish/Syrian border. However, the most important site for the Halaf tradition was the site of Tell Arpachiyah, now located in the suburbs of Mosul, Iraq.

The Ziggurat (or Great Ziggurat) of Ur (Sumerian: 𒂍𒋼𒅎𒅍 é-temen-ní-gùru "Etemenniguru", meaning "house whose foundation creates terror") is a Neo-Sumerian ziggurat in what was the city of Ur near Nasiriyah, in present-day Dhi Qar Province, Iraq. The structure was built during the Early Bronze Age (21st century BC) by King Ur-Nammu of the Third Dynasty of Ur. It had crumbled to ruins by the 6th century BC of the Neo-Babylonian period, when it was restored by King Nabonidus.

Its remains were excavated in the 1920s and 1930s by international teams led by Sir Leonard Woolley. Under Saddam Hussein in the 1980s, they were encased by a partial reconstruction of the façade and the monumental staircase. Today, Ur Tourist City is being developed adjacent to the site to serve visiting pilgrims and tourists. The Ziggurat of Ur is the best-preserved of those known from Mesopotamia, besides the ziggurat of Dur Untash (Chogha Zanbil). It is one of three well-preserved structures of the Neo-Sumerian city of Ur, along with the Royal Mausolea and the Palace of Ur-Nammu (the E-hursag).