Frederick James Lamb, 3rd Viscount Melbourne, GCB, PC (17 April 1782 – 29 January 1853[1]), known as The Lord Beauvale from 1839 to 1848, was a British diplomat.

[citation needed] Despite a certain personal distance between them, Lord Palmerston, as Foreign Secretary placed great confidence in Lamb, wrote to him in a courteous style very different from his usual brusque manner, and left the running of the Vienna Embassy almost entirely in his hands.

[7] Palmerston's biographer notes that the marriage coincided with the early stages of the Oriental Crisis of 1840, and that the two men, although they were then personally barely on speaking terms, co-operated in an entirely professional way to resolve it.

[9] Relations between the two men became friendlier in later years, partly because both Palmerston and Emily were fond of Frederick's wife Alexandrina.

It was generally considered to be a love marriage: even though Alexandrina was more than thirty years her husband's junior, he was described as being "as handsome and debonair at sixty as he had been at twenty-five.