Detrosier's parents were Manchester
merchant Robert Norris and a French woman named Detrosier. He was born in
London but was abandoned. He was then
adopted by Charles Barnes, a
Swedenborgian tailor who raised him in
Hulme, Manchester. Barnes treated him as his own son and named him Rowley. Before he started work aged nine, Detrosier had received only informal education, including that from the Manchester Benevolent Vegetarian Institute. He worked in a variety of menial jobs and married aged nineteen but managed to teach himself something of
French,
Latin,
mathematics,
astronomy,
physics,
chemistry,
botany, and
geology. His appetite for learning reduced Detrosier to dire financial straits by 1821 and he was only rescued by the
patronage of
John Shuttleworth, who found him a more secure and responsible job as a clerk and salesman. At this time, he also discovered his birth parentage. ==Lecturer and preacher==