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In 602, having created unrest in the legions by reforms intended to reduce the expenses of their maintenance, Maurice ordered the Balkan army, then campaigning against the Avars, to winter on the north side of the Danube, the unprotected far side of the river's protective boundary. The army almost immediately revolted and marched on the capital, with Phocas at its head. Within a month, Maurice's government had collapsed, the Emperor abdicated and fled the city, and the "Green" faction in Constantinople acclaimed Phocas as emperor. He was crowned in the Church of St. John the Baptist and his wife Leontia was invested with the rank of Augusta. Maurice, who represented little genuine threat, was dragged from his monastic sanctuary at Chalcedon, and killed along with his five sons. It is said that he had to watch as his sons were executed in front of his eyes. The bodies were thrown in the sea and the heads of all were exhibited in Constantinople before Phocas made arrangements for a Christian burial for the relics of his deeply pious predecessor.
Phocas's rule was welcomed at first by many because he lowered taxes, which had been high during the reign of Maurice. Fulsome letters of courtly praise from Pope Gregory I are attested. The pope, Saint Gregory, appreciated his acceptance of the reforms he had begun. The agrarian reforms of the Church in Italy and particularly in Sicily had been followed in Egypt by the Orthodox Patriarchs. The reform consisted in naming "rectores" as administrators of the latifundia and eliminating all sort of contractors and parasites who exploited the tenant farmers, reducing them to misery, while undermining the income of the owners.
The Church needed money to pay for hospitals, maternities, orphanotrophies – all social infrastructures that the state had left to the clergy. Phocas faced great opposition and was regarded by many as a "populist". His coup d'état was the first violent regime change in Constantinople since its foundation by Constantine. He is reported to have responded to this opposition with cruelty, allegedly killing thousands in an effort to keep control of the government. This was probably an exaggeration. No histories actually written under Phocas survive, and thus we are dependent for information on historians writing under his successors, who had an interest in blackening Phocas' reputation.
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