Lady Moyra Campbell, who was one of the Monarch's six maids of honour at her coronation in 1953, died on Sunday in Belfast

The Queen is mourning the loss of one of her closest friends Lady Moyra Campbell in lockdown.

Lady Moyra Campbell was one of the Monarch's six maids of honour at her 1953 coronation at Westminster Abbey following her accession the year prior.

Known then as Lady Moyra Hamilton, she was the only daughter of the 4th Duke of Abercorn James Hamilton and a first cousin of Princess Diana's father, the 8th Earl of Spencer, John Spencer.

The treasured friend died at Somme Nursing Home in Belfast on Sunday, just seven days after the passing of Lady Elizabeth Anson who was the Queen's cousin and one of her closest confidantes.

A Royal source told MailOnline: "It's very sad. Her Majesty kept in touch with all her former maids of honour."

Lady Moyra was 22 when the young Queen chose her to be one of her train bearers who carried her six-yard Robe of State, watched by an estimated 20 million Brits on possibly their first television set.

She was well-known for her charity work and is survived by her husband Commander Peter Campbell and her sons Rory and Michael.