Speaking of long distance strategic aircraft, the Grandpa of C5A (B), A400, C-17:
The Bristol Britannia was the world’s first long range ‘jet-prop’ airliner. It was developed as part of the drive to re-build Britain’s civil aviation industry after the Second World War when the focus at the Bristol Aeroplane Company had been mainly on bomber production. (From https://www.xm496.com/)