Inanna was the goddess of love, war, and fertility in Sumeria. Over a long period of time the locals worshipped Inanna as one of many gods/goddesses in the land between the rivers. Gradually, she became known as the Queen of Heaven. As the Goddess of love she picked up many other names throughout the region.
Inanna remained popular well into the first couple hundred years of Christianity's spread.
From Wiki:
Inanna appears in more myths than any other Sumerian deity.[10][11][12]
She also had a uniquely high number of epithets and alternate names, comparable only to Nergal.[13] Many of her myths involve her taking over the domains of other deities. She was believed to have been given the mes, which represented all positive and negative aspects of civilization, by Enki, the god of wisdom. She was also believed to have taken over the Eanna temple from An, the god of the sky.
Alongside her twin brother Utu (later known as Shamash), Inanna was the enforcer of divine justice; she destroyed Mount Ebih for having challenged her authority, unleashed her fury upon the gardener Shukaletuda after he raped her in her sleep, and tracked down the bandit woman Bilulu and killed her in divine retribution for having murdered Dumuzid.
In the standard Akkadian version of the Epic of Gilgamesh, Ishtar asks Gilgamesh to become her consort. When he refuses, she unleashes the Bull of Heaven, resulting in the death of Enkidu and Gilgamesh's subsequent grapple with his mortality.