The Sheriff of Caithness was historically the royal official responsible for enforcing law and order in Caithness, Scotland. The sheriffdom of Caithness appears to have been created in the mid 12th century and to have been dissolved and incorporated into the sheriffdom of Inverness in the 13th century. in 1455, William Sinclair, Earl of Caithness gained a grant of the justiciary and sheriffdom of the area from the Sheriff of Inverness. Prior to 1748 most sheriffdoms were held on a hereditary basis. From that date, following the Jacobite uprising of 1745, the hereditary sheriffs were replaced by salaried sheriff-deputes, qualified advocates who were members of the Scottish Bar. In 1747, the office became known as the Sheriff of Caithness & Sutherland, however the sheriffdoms were disunited in 1806 again being known as the Sheriff of Caithness. It became the Sheriff of Sutherland & Caithness in 1857. In 1870 the office became known as the Sheriff of Caithness, Orkney & Shetland. It was again reorganised as the Sheriff of Caithness, Sutherland, Orkney & Zetland in 1946, but was abolished in 1975 when the current sheriffdom of Grampian, Highland and Islands was created. Sheriffs of Caithness William Sinclair, 1st Earl of Caithness, 1455–1470 John Sinclair Sheriffs of Caithness and Sutherland (1747) James Brodie of Spynie, 1747–1756 John Sinclair the younger, 1756–1784 James Traill, 1784–1806 (Sheriff of Caithness, 1806–) For Sutherland sheriffs for 1806–1857 see Sheriff of Sutherland Sheriffs of Caithness (1806) James Traill, 1806–1832 James Ivory, 1832–1833 (Sheriff of Bute, 1834–38) Robert Thomson, 1835–1857 Sheriffs of Sutherland and Caithness (1857) George Dingwall Fordyce 1857–1870 (Sheriff of Ross, Cromarty and Sutherland, 1870–1874) For Sutherland after 1870 see Sheriff of Ross, Cromarty and Sutherland Sheriffs of Caithness, Orkney and Shetland (1870) George Hunter MacThomas Thoms, 1870–1899 Christopher Nicholson Johnston, 1899–1900 John Wilson, 1900–1905 (Sheriff of Inverness, Elgin and Nairn, 1905–1912) Frank Towers Cooper 1905–1905 John Ferguson M'Lennan, KC, 1905–1917 Andrew Henderson Briggs Constable, 1917–1920 (Sheriff of Argyll, 1920) James Campbell Pitman, 1920–1929 Alexander Maitland, QC, 1929–1931 John Charles Watson, QC, 1931–1944 Thomas Blantyre Simpson, QC, 1944-1946 Sheriffs of Caithness, Sutherland, Orkney & Zetland (1946) Thomas Blantyre Simpson, QC, 1946–1952 (Sheriff of Perth and Angus, 1952–1954) Francis Clifford Watt, QC, 1952–1961 (Sheriff of Stirling, Dunbarton and Clackmannan, 1961) Harald Robert Leslie, 1961–1965 (Chairman of Scottish Land Court, 1965) Sir Frederick W.F. O'Brien, 1965–1975 Sheriffdom abolished in 1975 and replaced by the current sheriffdom of Grampian,