Since when he Francis Wallace Grenfell's rank in the British Army been the highest rank?
Field marshal (United Kingdom) Field Marshal has been the highest rank in the British Army since 1736. A five-star rank with NATO code OF-10, it is equivalent to an Admiral of the Fleet in the Royal Navy or a Marshal of the Royal Air Force in the Royal Air Force (RAF). A Field Marshal's insignia consists of two crossed batons surrounded by yellow leaves below St Edward's Crown. Like Marshals of the RAF and Admirals of the Fleet, Field Marshals traditionally remain officers for life, though on half-pay when not in an appointment. The rank has been used sporadically throughout its history and was vacant during parts of the 18th and 19th centuries (when all former holders of the rank were deceased). After the Second World War, it became standard practice to appoint the Chief of the Imperial General Staff (later renamed Chief of the General Staff) to the rank on his last day in the post. Army officers occupying the post of Chief of the Defence Staff, the professional head of all the British Armed Forces, were usually promoted to the rank upon their appointment.
Baron Grenfell Baron Grenfell, of Kilvey in the County of Glamorgan, is a title in the Peerage of the United Kingdom. It was created on 15 July 1902 for the military commander Sir Francis Grenfell. His eldest son, the second Baron, was Deputy Speaker of the House of Lords and Chairman of Committees from 1963 to 1976. s of 2010 the title is held by the latter's son, the third Baron, who succeeded in 1976. He previously worked for the World Bank. Lord Grenfell lost his seat in the House of Lords after the passing of the House of Lords Act of 1999. However, in 2000 he was made a life peer as Baron Grenfell of Kilvey, of Kilvey in the County of Swansea, and was able to return to the House of Lords.