What effect did each of the different leaders of the Byzantine Empire between 800CE and 1025CE have on the strangth of the Empire itself?

Emperors regained control of much of the military, and the armies loyal to the emperor were depleted. In addition, political corruption spread throughout the government. All this internal turmoil once again weakened the empire. but in the 10th century emprie regianed much of it's former strength also due to activity of Basili II