The four Georgian Townhouses were built in the 1760's by Lord Monck (Charles Stanley Monck) for wealthy Irish merchants and nobility. He lived in No. 22, which became known as Monck House. The most important of the four houses is, however, No. 24 Upper Merrion Street. This house was leased to Garrett Wellesley, Earl of Mornington, in 1769 and has since been known as Mornington House. The house is remembered historically as being the birthplace of Arthur Wellesley, the 1st Duke of Wellington.

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