In September 1889, when he was sixteen, Sidney entered St Paul's School as a capitation scholar. St Paul's was one of the best-known public schools; these included Eton, Westminster, Charterhouse, Harrow, Rugby, Shrewsbury and Winchester – all boarding schools – and Merchant Taylors' and St Paul's, both day schools. St Paul's was located in a green and leafy suburb next to the River Thames. Sidney trekked daily between home and school, perhaps taking the Hammersmith and City underground line from Gower Street to Hammersmith or the District line to West Kensington or possibly bicycling; the invention of chain-driven safety bicycles in 1885 had started a cycling boom. That same autumn Sidney's younger sister Dora entered the North London Collegiate School for Girls, located at Sandall and Camden Roads. She had been recommended by Hugh Price Hughes; attitudes towards education for girls were changing. St Paul's School was founded around 1103 as a grammar school attached to St Paul's Cathedral. In the sixteenth century the school was endowed by John Colet, Dean of St Paul's Cathedral and a close friend of the Dutch humanist and theologian Desiderius Erasmus of Rotterdam. Colet's humanism inspired religious toleration, and under his statutes the school offered free education to 153 boys ‘of all nations… indifferently’, the number 153 a biblical allusion to the miraculous haul of fish in St John's 21:11.