Cydaea

Cydaea was the lover of Azmodan as well as one the Lord of Sin's lieutenants, she gained the title of Maiden of Lust and had command over her own band of succubi who she treated much like her own daughters.

Cydaea was obviously held in great regard by Azmodan and when the heroes arrived to stop Azmodan's invasion of Bastion's Keep the Lord of Sin had Cydaea protect the Heart of Sin, the power-source of his army.

Unfortunately for Azmodan his consort failed in her task and was slain whilst trying to defend the artefact.