In February 1960 The Queen announced her consent to the engagement of The Princess Margaret to Mr Antony Armstrong-Jones, and they were married in Westminster Abbey on 6 May. The honeymoon was spent in the West Indies. After marriage they made their home in an apartment in Kensington Palace. In October 1961 Mr Armstrong-Jones was created Earl of Snowdon and Viscount Linley.

They had two children. Their son, Lord Linley, was born on 3 November 1961 and christened David Albert Charles; their daughter, Lady Sarah Frances Elizabeth, was born on 1 May 1964. The marriage of The Princess to Lord Snowdon was dissolved in May 1978.