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One example that comes to mind is that of Princess Olga of Kiev (890-969).
According to one history of Kievan Rus called The Primary Chronicle, she took revenge on the tribe of the Drevlians for murdering her husband, Prince Igor, by both burning and burying various of them alive.
This occurred, however, prior to her conversion to Christianity.
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I think most Byzantine emperors oversaw at least some executions as a part of their civil duty. It appears that both Justinian and Constantine ordered executions that are controversial to some and both are saints in the Eastern Orthodox church (however Constantine would have ordered these executions before his baptism). Look at the Wiki pages for each and you will see the executions mentioned.
They were also both commanders of armies that carried out large military campaigns.
The important thing to note here is that the Church didn't command, or participate in the executions and that they were carried out as the business of government. Also, neither were clergy in the Church nor are these executions mentioned in their hagiographies. However, some military accomplishments are.