By far the greater part of this collection consists of certain official records of the administration, as Lord High Treasurer (from June 1673 until March 1679), of Sir Thomas Osborne, bart, later Viscount Latimer and Earl of Danby, and subsequently first Marquis of Carmarthen and first Duke of Leeds.
A few other items may be related to his tenure of office as Joint Treasurer, and later Treasurer, of the Navy (from 1668 until 1673). There is also a volume containing his household accounts, at Wallinford House, Westminster, in 1677; and occasional estate accounts of himself and his successors, from 1681 to 1717.