Prince Harry has unveiled the source behind his moniker "spare" and disclosed the royal family member who initially employed it.

Prince Harry and Meghan Markle
Meghan, Duchess of Sussex and Prince Harry, Duke of Sussex visit One World Observatory at One World Observatory on September 23, 2021 in New York City. Roy Rochlin/Getty Images

Last year, Prince Harry's supporters were taken aback by the severity of the nickname upon its revelation. Now, he has shed light on its origins.

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Harry disclosed that his father, King Charles, was the one who bestowed the nickname upon him, prompted by Princess Diana's delivery of a second son. Harry recounted his father's response, recalling the words: "Wonderful! Now you've given me an heir and a spare - my work is done."

Trooping The Colour 2018
Meghan, Duchess of Sussex, Prince Charles, Prince of Wales and Prince Harry, Duke of Sussex stand on the balcony of Buckingham Palace during Trooping The Colour 2018 on June 9, 2018 in London, England. Photo by Max Mumby/Indigo/Getty Images

'The Guardian' highlighted Prince Harry's reported long-standing resentment towards his nickname, noting his expression of frustration in his memoir. Describing Harry's purportetd discontent with being referred to as the "spare," the newspaper reported how "Harry's resentment of being the 'spare' is the underlying theme of his book, through chapters on his childhood, his schooling, his career as a royal and in the British Army, his relationship with his parents and brother, and his life with Meghan through courtship, wedding and marriage, to their own experience of parenthood. "

In May, as Prince Harry prepares to return to England, his foremost priority is purportedly to visit his father, King Charles, 75, who was diagnosed with cancer earlier this year.

Meghan Markle and Prince Harry
Prince Harry and Meghan Markle attend a reception for young people at the Palace of Holyroodhouse on February 13, 2018 in Edinburgh, Scotland. Andrew Milligan - WPA Pool/Getty Images

The Duke of Sussex has been transparent about his desire to mend their relationship, and according to a royal source, he intends to prioritize a visit to his father upon arrival. Harry, 39, will fly in from his residence in California for his philanthropic endeavors with the Invictus Games, and it's believed he aims to maximize his time reconnecting with his family while he's back.

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Prince Harry, Royal family, King Charles, Spare, Memoir, Cancer Diagnosis, Invictus games, California