The crossword solution for the term 'Rival of Harrow' is Eton. Eton College is a prestigious British boarding school located in the town of Eton, near Windsor in Berkshire, England. Founded in 1440 by King Henry VI, it is one of the oldest schools in the world and is renowned for its academic excellence. It is also the rival of Harrow School, another prestigious British boarding school located in Harrow, London.