George, 4, was taken by his father, Prince William, from their Kensington Palace home to Thomas's Battersea school in southwest London, which says its most important rule is to "Be Kind" and charges almost 18,000 pounds ($23,490) per pupil per year.
"We expect our pupils to make impressive progress as a result of their own hard work, the best efforts of their teachers, the judicious support of their parents and the encouragement of their peers," the school says on its website.
A nervous-looking George, wearing a school uniform of dark shorts and a navy jumper with red trim, held his father's hand as the Head of Lower School, Helen Haslem, escorted the royal duo to his classroom.
His mother Kate missed the occasion due to acute morning sickness and has cancelled other engagements this week after the palace announced on Monday that she was expecting her third child.
(Reporting by Michael Holden, editing by Estelle Shirbon)
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
Follow NDTV for latest election news and live coverage of assembly elections 2019 in Maharashtra and Haryana.
Subscribe to our YouTube channel, like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.