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In page Anna of Russia:

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Anna founded the Cadet Corps in 1731, one year after coming to the throne. The Cadet Corps was a group of young boys starting at the age of eight being trained for the military. It incorporated a very rigorous training program which included all the schooling necessary for someone to hold an important position in the military. As time went on, the program was improved upon by other emperors and empresses, such as Catherine the Great. These began to include the arts and sciences into cadets' schooling, alongside established studies of military topics.[citation needed]