According to Sumerian mythology, which goddess is known as the "Queen of Heaven"?

Known as the "Queen of Heaven" and the Goddess of sex, war, justice, and political power is the Goddess Inanna the patron goddess of the Eanna temple at the city of Uruk, which was her main cult center.

Inanna was worshipped in Sumer at least as early as the Uruk period (c. 4000 BC – c. 3100 BC), but she had a little cult before the conquest of Sargon of Akkad. During the post-Sargonic era, she became one of the most widely venerated deities in the Sumerian pantheon, with temples across Mesopotamia.

The cult of Inanna/Ishtar, which may have been associated with a variety of sexual rites, was continued by the East Semitic-speaking people (Akkadians, Assyrians, and Babylonians) who succeeded and absorbed the Sumerians in the region.

Inanna was especially beloved by the Assyrians, who elevated her to become the highest deity in their pantheon, ranking above their own national god Ashur.

Inanna/Ishtar is alluded to in the Hebrew Bible. And, she greatly influenced the Phoenician goddess Astoreth, who later influenced the development of the Greek goddess Aphrodite.

Inanna cult continued to flourish until its gradual decline between the first and sixth centuries AD in the wake of Christianity, though it survived in parts of Upper Mesopotamia among Assyrian communities as late as the eighteenth century.

In her astral aspect, Inana/Ištar is the planet Venus, the morning and the evening star.