
One of Phocas' main concerns when he became emperor was dealing with the remnants of Maurice's family. He had Peter, Maurice's brother, killed before shutting Constantina, Maurice's widow, and three daughters up in a convent. However, Constantina was not going to just accept exile after what Phocas had already done to her family and she plotted to have Phocas overthrown. After having Constantina tortured to find out the full details of the plot, Phocas now decided he had to rid himself of the remainder of Maurice's family and had Constantina and three girls executed as well. Once again Phocas demonstrated a distinct lack of humanity and had them executed at the precise location where the men had been killed in 602. From very early on in his reign, Phocas had problems. One of his generals rebelled against his rule and seized Edessa. This general, Narses, was regarded as one of the finest generals in the Roman Army. This seemed to matter very little to Phocas as, in 605, he had Narses burned alive. This is said to have caused serious upset among the Eastern Roman Army ranks but pleased no end the Persians whom Narses had been particularly unforgiving against. Phocas here has not only demonstrated vicious behaviour yet again but also a distinct lack of intelligence. The Imperial Army was the main kingmaker in the Byzantine empire and to eliminate one of it's best generals in such brutal fashion was clearly not the best course of action for a usurping emperor to take. In 607, around the same time he had Constantina and her daughters killed, Phocas also executed Germanos and his daughter. Germanos had been the general he used to besiege Edessa when Narses revolt had begun. The fact that Phocas was now executing with seeming impunity key generals in his army shows that his reign was fast descending into tyranny and the chroniclers refer to him as "The Tyrant".
In 608, another rebellion against Phocas was in the works and the emperor responded in much the same vein; by wiping out entire families. Around that time, there was a plague and further Persian invasions. However, according to Theophanes the chronicler, Phocas remained the biggest of all the Romans current woes, murdering and arresting without justification or cause. In 609, Theophanes tells of more chaos in Phocas' realm as the citizens turned against the emperor. A man by the name of Kosmas did the emperor's dirty work by mutilating, hanging, beheading and even sowing up in sacks and flinging into the sea people with dissenting voices. By that stage Phocas was beyond all hope as a ruler and the senate urged a general by the name of Heraclius to take power from the tyrant. Heraclius arrived at Constantinople around October of 610. Delighted by this, the citizens seized Phocas and brought to an end his dismal, bloody and generally dreadful rule.