The Duke told head coach Paul Simpson it had been a "good day".
"It was really nice actually".
George struck a confident pose as he set off with his father this morning (7 September) and it seems that his confidence carried him through the day.
But it was George who took center stage on Thursday.
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William said later that George's first day at school had been a success.
Prince George will be taught a range of subjects and activities from ballet and art to drama, French, music and physical education.
The Duchess of Cambridge, Kate Middleton, who is now pregnant with her third child originally planned that she would be the one to take her son to school however she was dealing with severe morning sickness so couldn't make it.
George, the third in line to the British throne, arrived wearing his "summer uniform", which consisted of a blue button-down shirt beneath a navy v-neck sweater and matching shorts.
Prince William and Prince George were met on arrival at the school by the Head of Lower School, Helen Haslem, who escorted the father and son to Prince George's reception classroom.
His father, Prince William, joined him as mom Kate was too ill to come.. Regarding George and his classmates' first day, Ben revealed, "The emphasis will be on a very, very gentle start".
The condition means she has had to cancel several public engagements, including accompanying George to Thomas's Battersea. And fortunately for Kate, there will be plenty more school runs to do - and, of course, plenty more first days of school.