Computer pioneer and codebreaker Alan Turing will feature on the new design of the Bank of England's £50 note.
He is celebrated for his code-cracking work that proved vital to the Allies in World War Two.
The £50 note will be the last of the Bank of England collection to switch from paper to polymer when it enters circulation by the end of 2021.
The note was once described as the "currency of corrupt elites" and is the least used in daily transactions.
However, there are still 344 million £50 notes in circulation, with a combined value of £17.2bn, according to the Bank of England's banknote circulation figures.
"Alan Turing was an outstanding mathematician whose work has had an enormous impact on how we live today," said Bank of England governor Mark Carney.
"As the father of computer science and artificial intelligence, as well as a war hero, Alan Turing's contributions were far-ranging and path breaking. Turing is a giant on whose shoulders so many now stand."