Cú Chulainn
Though Cú Chulainn had many lovers, Emer's only jealousy came when he was entranced into love with Fand, wife of Manannán mac Lir, the king of the great sea, as recounted in the narrative "Serglige Con Culainn" ("The Wasting Sickness of Cú Chulainn"). She decided to kill her rival, but when she saw the strength of Fand's love for Cú Chulainn she decided to give him up to her. Fand, touched by Emer's magnanimity, decided to return to her own husband. Manannán shook his cloak between Cú Chulainn and Fand, ensuring the two would never meet again, and Cú Chulainn and Emer drank a potion to wipe the whole affair from their memories.