Ossulstone was an ancient hundred in the south east of the county of Middlesex, England.British History Online - Hundreds of Middlesex Its area has been entirely absorbed by the growth of London; and now corresponds to the part of Inner London that's north of the River Thames and, from Outer London, parts of the London boroughs of Barnet, Brent, Ealing, Haringey and Hounslow. History It was named after "Oswald's Stone" or "Oswulf's Stone", an unmarked pre-Roman monolith which was situated at Ty… (More on Ossulstone)