A murder investigation has been launched after historian Adrian Greenwood was found stabbed to death following a "vicious and sustained attack".
Police were called to Iffley Road in Oxford at around 3pm on Thursday after the 42-year-old was found by his cleaner in the hallway of his four storey house.
He was pronounced dead at the scene and a post-mortem examination gave the cause of death as multiple stab wounds.
Thames Valley Police are yet to recover the murder weapon, which they believe is a bladed article.
Formal identification is yet to take place but detectives are satisfied the man was Mr Greenwood, who was also a biographer, author and art dealer.
A 26-year-old man has been arrested on suspicion of murder and is in police custody.
Head of the Thames Valley Police Major Crime Unit, Detective Superintendent Chris Ward, said: "We believe that Mr Greenwood was an historian, biographer, author and a dealer in art, cars and other historic artefacts.
"He was usually smartly dressed, and often wore a tweed jacket."
He continued: "We believe that an altercation has taken place in the hallway of this house. The post-mortem confirmed that Mr Greenwood died following a vicious and sustained attack.
"It is very likely that the offender may have injuries as a result of this altercation."
Detectives are keeping an open mind in terms of motive, and would like to speak to anyone who may have information to come forward.
Mr Ward added: "The investigation team would like to hear from anyone who has information about Mr Greenwood's associates, or anyone who has had a personal or business engagement with him in the last few weeks.
"The last sighting of Mr Greenwood was at Sainsbury's supermarket in Oxford Road, Kidlington, at about 6pm on Tuesday 5th April.
"If you saw him after this time we would also like to hear from you."