Baron Godolphin is a title that was created three times: first in the Peerage of England, next in the Peerage of Great Britain, and lastly in the Peerage of the United Kingdom. Through family relations, the barons from all three creations were also Governors of the Isles of Scilly until 1834 when the lease was sold.
The first creation, as Baron Godolphin, of Rialton in the County of Cornwall, was in the Peerage of England in September 1684 for Sidney Godolphin, a leading politician of the late seventeenth and early eighteenth centuries and former MP for Helston in Cornwall. In 1704 he was made a Knight of the Garter, and in December 1706 he was created Viscount Rialton and Earl of Godolphin. Upon his death in 1712, all these titles passed to his son Francis.
The second creation, as Baron Godolphin, of Helston in the County of Cornwall, was in the Peerage of Great Britain in 1735 for Francis Godolphin, 2nd Earl of Godolphin, with remainder, in default of male issue of his own, to the male issue of his deceased uncle Henry Godolphin, the Dean of St Paul's. The 2nd Earl died on 17 January 1766. The Godolphin earldom, the Rialton viscounty, and Godolphin barony of 1684 became extinct; but the Godolphin barony of 1735 devolved according to the special remainder upon his cousin Francis Godolphin, 2nd Baron Godolphin. He had previously represented Helston in the House of Commons. On his death in 1785 this title became extinct as well.