Her Wikipedia article begins, "Sophia Dorothea of Celle (15 September 1666 – 13 November 1726) was the repudiated wife of George I of Great Britain and mother of George II. The union with her first cousin was an arranged marriage of state, instigated by the machinations of his mother, Sophia of Hanover. She is best remembered for her alleged affair with Philip Christoph von Königsmarck that led to her being imprisoned in the Castle of Ahlden for the last thirty years of her life.” Later, the same article continues, "Sophia Dorothea's infidelity to her husband is not absolutely proven, as it is possible that the letters which purport to have passed between Königsmarck and herself are forgeries. George II was very disturbed by the imprisonment of his mother, and it was one of a number of reasons that contributed to the relationship of mutual hatred between him and his father...George would not allow mourning in Hanover or London. He was furious when he heard that his daughter's court in Berlin wore black...George I died four weeks later, presumably shortly after receiving his deceased wife's final letter."