Princess Margaret and Lord Snowdon had one of the Royal Family’s more dramatic relationships, as shown in royal series The Crown The second series chartered the blossoming romance, while the third focusses on the end of their marriage    Princess Margaret met Antony Armstrong-Jones, the future Lord Snowdon, in 1958  When they first met, Princess Margaret was 28 and had just ended her relationship with divorcee Captain Peter Townsend, who was 44  According to Lord Snowdon’s authorised biographer Anne de Courcy, they started seeing each other in secret   READ MORE Princess Margaret diet secrets: Documents reveal what she ate  She told the Telegraph: ”Nobody knew about their relationship, there wasn’t a whisper about it  “She would see him in secret at his studio and yes, he would join her at parties, but no one could pinpoint which man she was interested in  “The press focused more on the ones who were seen to be eligible. “They didn’t think of Tony who was often in the background ”  The couple eventually married in 1960 after a secretive proposal and had their first child, David Armstrong-Jones, in 1961  Cracks began to surface a few years into their marriage, however. Talking to Vanity Fair, Margaret’s biographer Christopher Warwick said Lord Snowdon often wasn’t around, as he focussed on his work  Margaret, on the other hand, wanted to spend more time with her husband and allegedly “could be very possessive”   READ MORE Why Princess Margaret was ‘livid’ at Ronald Reagan’s behaviour  Margaret later told Mr Warwick Lord Snowdon was a “serial adulterer”, which caused her severe distress when she was pregnant with their second child, the now Lady Sarah Chatto, in 1963  The Princess started having affairs not long after, and their relationship ultimately ended in a very public fashion after 16 years of marriage  In 1976, Margaret was photographed with gardener Roddy Llewellyn, with whom she was having an affair, on holiday in Mustique  Lord Snowdon and Princess Margaret split in the same year, with Kensington Palace announcing there were “no plans for divorce proceedings ”  Trending  Princess Margaret and Lord Snowdon’s divorce was finalised two years later in 1978, with a spokesman for the Princess declaring they remained on a “friendly basis”  They said: “The marriage has broken down and the couple have lived apart for two years  “These are obviously the grounds for divorce. “Naturally, Princess Margaret and Lord Snowdon will continue to see each other on the same friendly basis as they have with each other over the last two years ”