Daniel Lambert (13 March 1770 – 21 June 1809) was a gaol keeper[n 1] and animal breeder from Leicester, England, famous for his unusually large size. After serving four years as an apprentice at an engraving and die casting works in Birmingham, he returned to Leicester around 1788 and succeeded his father as keeper of Leicester's gaol. He was a keen sportsman and extremely strong, on one occasion fighting a bear in the streets of Leicester. He was an expert in sporting animals, widely respected for his expertise with dogs, horses and fighting cocks.
At the time of Lambert's return to Leicester his weight began to increase steadily, even though he was a keen sportsman and, by his own account, abstained from drinking alcohol and did not eat unusual amounts of food. In 1805, Lambert's gaol closed. By this time he weighed 50 stone (700 lb; 320 kg), and had become the heaviest authenticated person up to that point in recorded history. Unemployable and sensitive about his bulk, Lambert became a recluse.