Prince Harry's feelings about his treatment as the second-born son have always been clear - and they became even more so after he chose to name his bombshell memoir Spare .

The spare to the heir is a well-known royal phrase. It means that any child born after their sibling, the heir, is a second to them if something should happen. While there have been many famous spares throughout history, including the late Queen's father, King George VI , the word is now largely tied to Harry's controversial memoir.

The nickname appears to have always been a sticking point for the Duke , so much so that he used his tell-all book to reveal which member of his family first called him it.

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