If the Duchess of Cambridge gives birth by the end of the day as expected, the royal baby will be born on patriotic St George's Day.
The patron saint of England, St George is heralded for his honour, bravery and gallantry.
Surrounded by myth, one legend tells of St George's defeat of a dragon.
The actual St George was born in Cappadocia - an area now in Turkey - and he lived during the 3rd century.
He became a Roman soldier and protested against Rome's treatment of Christians, was imprisoned and eventually executed for refusing to denounce his faith.
The flag of Saint George - a red cross on a white background - is the flag of England and is incorporated into the Union Jack.
The royal baby would also share their birthday with Lady Gabriella Windsor - the daughter of Prince and Princess Michael of Kent, who was born at the Lindo Wing, where Kate is in labour, on April 23 in 1981.
Famous names celebrating their birthdays on Monday include the model Gigi Hadid and actor John Hannah.
The baby has just missed arriving on the Queen's 92nd birthday which was on Saturday.
William and Kate are set to celebrate their seventh wedding anniversary on April 29, while Princess Charlotte turns three on May 2.