They are some of the most important and "noteworthy" figures in British history but according to a new survey, more than half of Welsh people admit they struggle identify the famous faces who appear on our banknotes.
Researchers presented 2,000 British adults with images of the £5, £10, £20 and £50 notes.
In Wales, just two in five were able to name philanthropist and social reformer Elizabeth Fry who is the face of the £5, with 24% of those polled thinking it was Florence Nightingale.
A further 8% thought the face belonged to Queen Victoria, while 24% admitted that they had no idea who she was.
5% thought Darwin was engineer Isambard Kingdom Brunel, while 6% thought he was Albert Einstein.
Three quarters were also unaware economist Adam Smith's face is on the £20 with 13% thinking the £10 note featured William Shakespeare.
Vix Leyton of cash back site Quidco, which carried out the study, said: "The research shows that Brits have an appetite for immortalising some more recent British Icons on our bank notes, and despite the worthiness of our current line up, it might be time for a refresh.
"This lack of knowledge could, in part, be explained by the rapid move towards a cashless society - exchanging bank notes is not quite so commonplace as it once was."
Who Wales would like to see on banknotes:
Jane Austen 33%
Roald Dahl 32%
Tom Jones 22%
The Beatles 20%
JK Rowling 14%
Cilla Black 12%
Shirley Bassey 10%
David Beckham 10%
Ant & Dec 9%
Jessica Ennis Hill 8%