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This is because Peter and Ivan were minors at the time they inherited the throne.
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Peter's first wife
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Peter takes a long visit to West Europe to learn about their customs and manufacturing techniques
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Instead of the calendar starting from the creation of the universe, Peter changes it so that they number their years from 8 days after the birth of Christ, to match with many European Christian countries.
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Thousands of serfs were sent to work on building the city. An estimated 25,000-100,000 people dies from the bad conditions.
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Peter's second wife, who he chose as the heir to the throne when he died
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In this way, Peter gains absolute control over the matter of the succession to the throne.
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