Which famous military leader was nicknamed 'The Iron Duke'?

Field Marshal Arthur Wellesley, 1st Duke of Wellington, (1 May 1769 – 14 September 1852) was an Anglo-Irish soldier and statesman who was one of the leading military and political figures of 19th-century Britain. His defeat of Napoleon at the Battle of Waterloo in 1815 put him in the first rank of Britain's military heroes.

The Iron Duke his commonly used nickname originally related to his consistent political resolve rather than to any particular incident. In various cases its editorial use appears to be disparaging. It is likely that its use became more widespread after an incident in 1832 in which he installed metal shutters to prevent rioters breaking windows at Apsley House. The term may have been made increasingly popular by Punch cartoons published in 1844–45.

Wellington is famous for his adaptive defensive style of warfare, resulting in several victories against numerically superior forces while minimising his own losses. He is regarded as one of the greatest defensive commanders of all time, and many of his tactics and battle plans are still studied in military academies around the world.