Above: Bust of Oliver Cromwell by Louis-François Roubiliac (detail) © Trustees of the British Museum.
21 - Cromwell's age at the time he married, 2 years younger than his wife Elizabeth Bourchier.
Cromwell's early life
9 - the number of children born to Cromwell and Elizabeth; 5 sons and 4 daughters.
8 years - the time it took Cromwell to rise from a man with no military experience to the position of commander-in-chief of the parliamentary army.
The English Civil War
23 October 1642 - the date of the first major engagement of the English Civil War, at the Battle of Edge Hill.
Civil War battles
85,000 - the estimated number of people made homeless by the English Civil War.
English Civil War casualties
3,400 - the approximate number of Irish defenders killed after the Siege of Drogheda.
Cromwell in Ireland
59 - the number of signatories of Charles I's death warrant.
The execution of Charles I
£6 million - the equivalent budget for Cromwell's state funeral in current money.
28 years - the estimated time that Cromwell's severed head remained on display upon a spike on the roof of Westminster Hall.
299 - the number of years after his posthumous execution that Cromwell's head was reburied, in a secret ceremony at Sidney Sussex, Cambridge.