 Complete the following phrase:  Cavendish was born in Westminster, the third son of George Cavendish, 1st Earl of Burlington and Lady Elizabeth Compton, daughter and heiress of the 7th Earl of Northampton. Cavendish was educated at Eton College and Trinity College, Cambridge. He was commissioned as a lieutet in the 10th Dragoons in 1808 and was deployed to Spain and was wounded at the 