[HIGHLIGHTS] The gay lover of Princess Margaret's husband: "Tony was a great seducer. He was mischievous but wonderful."

The Real Crown: Inside the House of Windsor will premiere on ITVX on April 20. The series uncovers the affair between Princess Margaret and Lord Snowdon.

Nicky Haslam, who had an affair with Armstrong-Jones, describes him as a "great seducer" Lady Anne Glenconner, who was Margaret's lady-in-waiting, accuses Snowdon of being spiteful and doing "horrible things" The couple married in May 1960 and had two children, but did not divorce until 1978.