The actor will play Antony Armstrong-Jones, aka the 1st Earl of Snowdon, in season two of the Netflix hit, which chronicles the early days of the reign of Queen Elizabeth II.

Armstrong-Jones, who died earlier this month (Jan17) at the age of 86, was married to Princess Margaret, The Queen's late sister, who is portrayed by Vanessa Kirby on The Crown.

They wed in 1960 and divorced in 1978.