High Sheriff of Greater London
The office of high sheriff, as the monarch's representative in a county, is over 1,000 years old, with its establishment before the Norman Conquest. The office of high sheriff remained first in precedence in each county until the reign of Edward VII when an Order in Council in 1908 gave the lord-lieutenant the prime office under the Crown as the sovereign's personal representative.
Source: Wikipedia — High Sheriff of Greater London (CC BY-SA 4.0)