Agreeing that this is prob. Hecate. She is a chthonic deity, and has been associated with the owl. The eclipse symbol behind her black throne is a pretty clear moon symbol, and Hecate is associated with the moon - and her first identity was as a moon goddess.
Hectates Wheel This symbol represents the three aspects of the goddess, maiden, mother and crone. In Greek legend, Hectate was the guardian of the crossroads before she evolved into a goddess of magic and sorcery. The wheel is used to symbolise the power of knowledge and life.