Ossulstone is an obsolete subdivision (hundred) covering 26.4% of – and the most metropolitan part – of the historic county of Middlesex, England. It surrounded but did not include the City of London and the area has been entirely absorbed by the growth of London. It now corresponds to the seven London Boroughs of Inner London north of the Thames and, from Outer London, in decreasing order, certain historic parishes of the London boroughs of Ealing, Brent, Barnet, and Haringey. History It was named after "Oswald's Stone" or "Oswulf's Stone", an unmarked minor pre-Roman monolith which stood at Tyburn (the modern-day junction of the Edgware Road with Bayswater Road). Oswald's Stone was earthed over in 1819, but dug up three years later because of its presumed historical significance. Later in the 19th century it was to be found leaning against Marble Arch. In 1869, shortly after an archaeological journal published an article about the stone, it disappeared and it has not been found since. Originally meeting at Oswald's Stone, the hundred court eventually moved south-east to the vicinity of Holborn, where by the 19th century it was being held in a building in the north east corner of Red Lion Square, by that stage an outpost of the legal quarter of London close to Lincoln's Inn. Following the de facto end of hundreds as a judicial unit in the late 19th century, the building became the headquarters of Conway Hall Ethical Society. It was always the largest of the six hundreds of Middlesex, and from early medieval times it had more than 20 parishes and some of the most complicated ecclesiastical units and liberties in the country, as there were many medieval foundations outside of London's walls. Parishes Taking New Brentford as part of Brentford Ossulstone had fourteen land-border parishes — one, St Pancras, only as to a far corner in Highgate. Borders clockwise Ealing bordered three parishes of Elthorne to the west. Six parishes (from a little of Ealing to a corner of St Pancras in Highgate) bordered three parishes of Gore hundred to the north-west. Then, proceeding clockwise, an arm of Finchley and the strip parish of Friern Barnet formed a single counter-salient into the small parishes in and around Chipping Barnet in Hertfordshire, these being the only great salient into Middlesex's shape. Hornsey, Stoke Newington and Hackney in the hundred's northeast bounded Tottenham parish in Edmonton hundred