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In page Catherine the Great:

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In all other aspects, the marriage proved unsuccessful; it remained unconsummated for years due to Peter III's mental immaturity.[citation needed] After Peter took a mistress, Catherine became involved with other prominent court figures. She soon became popular with several powerful political groups that opposed her husband. Unhappy with her marriage, Catherine became an avid reader of books, mostly in French.[4] She disparaged her husband for his devotion to reading on the one hand "Lutheran prayer-books, the other the history of and trial of some highway robbers who had been hanged or broken on the wheel".[5]