Field Marshal Frederick Sleigh Roberts, 1st Earl Roberts, was a British Victorian era general who became one of the most successful British military commanders of his time. Born in India to an Anglo-Irish family, Roberts joined the East India Company Army and served as a young officer in the Indian Rebellion during which he was awarded the Victoria Cross for gallantry. He was then transferred to the British Army and fought in the Expedition to Abyssinia and the Second Anglo-Afghan War, in which his exploits earned him widespread fame. Roberts would go on to serve as the Commander-in-Chief, India before leading British Forces for a year during the Second Boer War. He also became the last Commander-in-Chief of the Forces before the post was abolished in 1904.

Field marshal (FM) 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 the Tudor Crown. Like Marshals of the Royal Air Force and Admirals of the Fleet, Field Marshals traditionally remain officers for life, though on half-pay when not in an appointment or retired. The rank has been used sporadically throughout its history, and was vacant during parts of the 18th and 19th centuries. After the Second World War, it became standard practice to appoint the Chief of the Imperial 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.