The 73-year-old travelled to be by his mother's side along with the Queen's three other children, Princess Anne, Prince Andrew and Prince Edward.
Their three children Prince George, Princess Charlotte and Prince Louis attended their first day of school on Thursday at Lambrook School in Windsor.
William only became a full-time royal at the age of 35 in 2017, when he stepped down from his air ambulance role. He has focused much of his charitable work on mental health, particularly trying to break the stigma surrounding men's mental health.
It is up to the new king to decide whether to, or when to, confer the title created for the male heir to the throne.
George is now second in line to the throne, Charlotte third, and Louis fourth, with Harry once again fifth in line.
In the Queen's Platinum Jubilee celebrations, she expressed her wishes for Camilla to take the title when Charles took the throne.
The Queen's death marks the end of 70 years on the throne, and follows the death of her husband Prince Philip who died on April 9, 2021, aged 99.

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