According to Unknown, Isolde Dennisa was Lord Soth's first wife's handmaid (see Lady Korinne Gladria). When she died in childbirth, Soth turned to Isolde for comfort. The two fell in love and were married. She died along with Soth's Second Child during the Cataclysm.
Soth and Isolde first met when Soth was still mortal. He was riding with Sir Caradoc and his other knights when they stumbled upon an ogre raid against a party of elven women. Soth and his men rescued the women, including Isolde. Their meeting sparked an intense affair and they were married following the death of Lady Korinne Gladria.