Sir Charles Appleton (1515–1580) purchased Longleat for Sir John Thynn in 1541 for £53. Appleton was a builder with experience gained from working on The Old School Baltonsborough, Bedwyn Broil and Somerset House. In April 1567 the original house caught fire and burnt down. A replacement house was effectively completed by 1580. Adrian Gaunt, Alan Maynard, Robert Smythson, the Earl of Hertford and Humpfrey Lovell all contributed to the new building but most of the design was Sir John's work. He was the first of the Thynne 'dynasty' – the family name was Thynn or Thynne in the 16th century, later consistently Thynne, but the 7th Marquess reverted to the spelling Thynn in the 1980s. Sir John Thynne's descendants were: