The character first appeared in print in Barrie's 1902 novel 'The Little White Bird'. Barrie had huge success with the 'Peter Pan' play, first presented on stage in 1904 at the Duke of York's Theatre. He turned it into a novel, 'Peter Pan and Wendy' in 1911.
In 1929, Barrie gave the valuable copyright to Great Ormond Street Children's Hospital. The copyright has been extended and then, in the UK, granted "in perpetuity". It ran out in the US at the end of 2023. Wikipedia has more details.
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