James Sadler (1753–1828) was a pioneering English balloonist and one of the earliest aviators in history. Born in Oxford, Sadler initially gained recognition as a pastry chef, but his passion for science and adventure led him to the world of aeronautics.

In 1784, James Sadler made history by becoming the first Englishman to ascend into the skies in a hot air balloon. His groundbreaking flight took place in Oxford, capturing the attention and imagination of the public. Over the next few years, Sadler continued to make significant contributions to the field of aviation, conducting numerous balloon ascents across England and Europe.

Notably, Sadler completed a spectacular night flight in 1811, illuminating his balloon with lanterns to captivate audiences and demonstrate the possibilities of manned flight in the dark. His courage and innovative spirit earned him widespread acclaim and established him as a key figure in the early history of aviation.

James Sadler's achievements extended beyond his personal ballooning exploits. He played a crucial role in advancing balloon technology and safety, contributing to the development of more reliable and efficient balloon designs. Additionally, he inspired future generations of aviators and contributed to the public's growing fascination with flight during the 18th and 19th centuries.

James Sadler's legacy as a pioneering aviator endures, marking him as a trailblazer who helped lay the foundation for the extraordinary advancements in aviation that would follow in the centuries to come.

James Sadler’s life and achievements have been commemorated by a number of memorials in the city. His first balloon ascent is recorded on a plaque mounted in a wall of Deadman’s Walk next to Merton Field and near the Botanic Gardens, his point of departure. The gravestone marking his final resting place in St Peter-in-the-East churchyard was refurbished by the RAeS in 1984, two hundred years after his historic achievement. Finally, on the Oxford Branch’s initiative, a RAeS Heritage Award plaque was unveiled in Oxford Town Hall in 2016 on the anniversary of the first flight.