On 23 November 1830 there was a riot in Owslebury. This was part of the wave of discontent among agricultural workers which had spread across southern England and expressed itself as the Swing Riots. A large mob formed and moved from farm to farm demanding money and threatening to destroy agricultural machinery. At Rosehill they assaulted Lord Northesk's steward, Moses Stanbrook, wrecked a winnowing machine, and extorted £5. John Boyes, a local farmer, accompanied the mob demanding that farmers and landlords sign an undertaking which read "We, the undersigned, are willing to give 2s. per day to our married labourers, and 9s. per week to single men, in consideration of having our rent and tithes abated in proportion". At Marwell Hall the lady of the house, Mrs. Alice Long, gave the mob £5 and signed John's document. Eventually the mob retreated to Owslebury Down. Nine people had signed John Boyes' document. The rioters were tried in Winchester at the end of the year and several were executed. There was a good deal of sympathy for John Boyes and he was twice acquitted before eventually being found guilty and sentenced to be transported to Van Diemen's Land for seven years. The trials were reported in The Times in December 1830 and January 1831. John Boyes did not complete his sentence. In 1835 the Home Secretary, Lord Melbourne, pardoned him and he returned home to his wife, Faith, and their children, in June of that year to continue farming in Owslebury. He died in Hensting in 1856. A folk song called "The Owslebury Lads", collected in the early 20th century, recalls these events. It can be heard sung by Steve Jordan on the CD "Folk Songs of Hampshire". It was collected at Winchester in 1906 by George B. Gardiner.
Archaeology
Several archaeological projects have been undertaken in the neighbourhood, including major excavations in the late 1960s and early 1970s of an important Iron Age and Rural settlement and cemetery.
Geology
Owslebury lies on the Upper Cretaceouschalk near the northern edge of the Hampshire Basin. The north of the parish is on the Seaford Chalk Formation. The village itself and Cockscomb Hill to the north-west are on high ground capped by the younger Newhaven Chalk Formation, deeply dissected by a dry valley running SW towards Hensting and Fishers Pond at Colden Common. Marwell in the south of the parish lies on the Palaeocene 'Reading Beds'.