The Sumerian goddess of love, beauty, and war was called Inanna.
Inanna was one of the most important deities of ancient Sumer. Her powers covered love, sexuality, warfare, political authority, divine law, and fertility, making her a far more complex figure than a goddess of romance alone. Her main cult center was the Eanna temple at Uruk, and she was associated with the planet Venus, whose morning and evening appearances helped shape her symbolism.
In later Akkadian, Babylonian, and Assyrian traditions, Inanna was identified with Ishtar. The two names reflect different linguistic and cultural traditions, although the goddess retained a broadly similar identity. Common symbols included the lion and the eight-pointed star. Her myths include Inanna's descent into the underworld and her relationship with Dumuzid.
Ninhursag was primarily an earth and mother goddess, while Ereshkigal ruled the underworld. Ninsun, Gilgamesh's divine mother in Sumerian tradition, was a different goddess. Inanna's combination of love and war is therefore central to the answer.