Here is a good story of palace intrigue and conspiracy. We turn our attention to late antiquity, to the Ostrogothic kingdom in Italy.
Amalasuntha (c. 495-535) was the daughter of Ostrogothic King Theoderic the Great. When Theoderic died, his grandson Athalaric nominally became king. But being a child, the real power lay with his mother Amalasuntha, who ruled as regent.