Quiz: How much do you know about Prince George?
Prince George is having a landmark moment as he starts school for the first time.
The four-year-old is the first of the Cambridges' children to enrol in formal education.
His sister Princess Charlotte is still two years shy of joining him, while the Duke and Duchess are due to welcome a third child in 2018.
How much do you know about the future king, Prince George?