"...Caradoc Dearborn, vanished six months after this, we never found his body ..."
-- Mad Eye Moody, showing Harry a picture of the original Order of the Phoenix (OP9)
Member of the Order of the Phoenix during the first war against Voldemort; missing and presumed dead (OP9). Harry saw him among the members of the original Order in Mad-Eye Moody’s photograph at Grimmauld Place.
Caradoc was a British Celtic Prince (usually Latinised to to Caractacus) who led a rebellion against Roman rule (Thanks to Ross Gillson).