Ishtar, (Akkadian), Sumerian Inanna, in Mesopotamian religion, goddess of war and sexual love. Ishtar is the Akkadian counterpart of the West Semitic goddess Astarte. Inanna, an important goddess in the Sumerian pantheon, came to be identified with Ishtar, but it is uncertain whether Inanna is also of Semitic origin or whether, as is more likely, her similarity to Ishtar caused the two to be identified.
Ishtar’s primary legacy from the Sumerian tradition is the role of fertility figure; she evolved, however, into a more complex character, surrounded in myth by death and disaster, a goddess of contradictory connotations and forces—fire and fire-quenching, rejoicing and tears, fair play and enmity. The Akkadian Ishtar is also, to a greater extent, an astral deity, associated with the planet Venus. With Shamash, the sun god, and Sin, the moon god, she forms a secondary astral triad. In this manifestation her symbol is a star with 6, 8, or 16 rays within a circle.
Ishtar’s story is close to the Isis and Osiris myth and how Isis did her best to find her husband's body and reunify it, according to prominent Egyptologist and author Zahi Hawas.
https://www.britannica.com/topic/Ishtar-Mesopotamian-goddess
http://www.egypttoday.com/Article/4/40285/Ancient-Mesopotamia-The-tale-of-Goddess-Ishtar-Inanna