Bill Frost, scientist with a connection to Wales (Tenby)
Bill FrostWelsh carpenter who patented the aeroplane in 1894 and took to the skies in a powered flying machine the following year, eight years before the Wright brothers attempt at Kitty Hawk.
Connection: Born in Tenby.
Frost may or may not have become airborne. If he did, it is noteworthy that his machine depended in part upon a bag filled with hydrogen gas. But he was an inventive and brave airman.
The Wright brothers claim is the first powered flight, this is a false claim, however, this was not known to them at the time so as a Welshman I forgive them.