Fragment of the 500-year-flag that flew as King Richard III was killed in the Battle of Bosworth Field set to sell for £5,000 Red and gold remnant believed to be from the then Henry Tudor's standard The future Henry VII defeated Richard III at the bloody fight in 1485 The flag hung by the tomb of Henry's standard bearer Sir Robert Harcourt It was passed down through the Northamptonshire family now selling it Auctioneer Charles Hanson said: 'Incredible find from important battle'