Ossulstone Hundred of Middlesex. The stone was covered over in 1851 when Marble Arch was moved to the area, but it was shortly afterwards unearthed and propped up against the Arch. It has not been seen since it was stolen in 1869. Tyburn gallows Although executions took place elsewhere (notably on Tower Hill, generally related to treason by gentlemen), the Roman road junction at Tyburn became associated with the place of criminal execution after most were moved here from Smithfield in the 1400s. Prisoners were taken in public procession from Newgate Prison in the City, via St Giles in the Fields and Oxford Street (then known as Tyburn Road). From the late 18th century, when public executions were no longer carried out at Tyburn, they occurred at Newgate Prison itself and at Horsemonger Lane Gaol in Southwark. The first recorded execution took place at a site next to the stream in 1196. William Fitz Osbert, populist leader who played a major role in an 1196 popular revolt in London, was cornered in the church of St Mary-le-Bow. He was dragged naked behind a horse to Tyburn, where he was hanged. In 1537, Henry VIII used Tyburn to execute the ringleaders of the Pilgrimage of Grace, including Sir Nicholas Tempest, one of the northern leaders of the Pilgrimage and the King's own Bowbearer of the Forest of Bowland. In 1571, the Tyburn Tree was erected near the junction of today's Edgware Road, Bayswater Road and Oxford Street, 200 m west of Marble Arch. The "Tree" or "Triple Tree" was a form of gallows, consisting of a horizontal wooden triangle supported by three legs (an arrangement known as a "three-legged mare" or "three-legged stool"). Multiple criminals could be hanged at once, and so the gallows were used for mass executions, such as on 23/06/1649 when 24 prisoners (23 men and 1 woman) were hanged simultaneously, having been conveyed there in eight carts. After executions, the bodies would be buried nearby or in later times removed for dissection by anatomists. The crowd would sometimes fight over a body with surgeons, for fear that dismemberment could prevent the resurrection of the body on Judgement Day (see Jack Sheppard, Dick Turpin or William Spiggot). The first victim of the "Tyburn Tree" was John Story, a Roman Catholic who was convicted and tried for treason. A plaque to the Catholic martyrs executed at Tyburn in the