The Williams baronetcy, of Tregullow in the County of Cornwall, was created in the Baronetage of the United Kingdom on 4 August 1866 for William Williams, a younger son of the Williams family of Caerhays and Burncoose, a Cornish mining family. He served as High Sheriff of Cornwall. The 2nd Baronet was Conservative Member of Parliament for Truro from 1865 to 1878.
Williams baronets, of Tregullow (1866) Sir William Williams, 1st Baronet (1791–1870) Sir Frederick Martin Williams, 2nd Baronet (1830–1878) Sir William Robert Williams, 3rd Baronet (1860–1903)The Times, Monday, 18 May 1903; pg. 9; Issue 37083; col F: Obituary of Sir William Robert Williams, 3rd Baronet Sir William Frederick Williams, 4th Baronet (1886–1905) Sir Frederick William Williams, 5th Baronet (1888–1913)The Times, Friday, 3 October 1913; pg. 6; Issue 40333; col B: Death Of A Baronet. An Overdose Of Ether In A Paris Hotel (Sir Frederick William Williams, 5th Baronet). Sir Burton Robert Williams, 6th Baronet (1889–1917)The Times, Friday, 23 December 1921; pg. 11; Issue 42911; col E: Obituaries-Sir F. L. Williams. He succeeded his brother, BR Williams, who was killed in action. Sir Frederick Law Williams, 7th Baronet (1862–1921) Sir William Law Williams, 8th Baronet (1907–1960)The Times, Saturday, 2 July 1960; pg. 10; Issue 54813; col E: Obituary: Sir William Law Williams Sir Robert Ernest Williams, 9th Baronet (1924–1976) Sir Donald Mark Williams, 10th Baronet (born 1954)
The heir presumptive is the present holder's brother Barton Matthew Williams (born 1956).
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