Robert Cecil, 1st Viscount Cecil of Chelwood
In September 1916, he wrote and circulated a Memorandum on Proposals for Diminishing the Occasion of Future Wars in the Cabinet.  He said peaceful procedures for settling disputes should be compulsory before there was any outbreak of fighting. Sanctions, including blockade, would be necessary to force countries to submit to peaceful procedures.  In November 1917, Cecil asked Arthur Balfour to set up a committee to consider the proposals for a League of Nations.  In  November 1918 he was appointed the head of the League of Nations section of the Foreign Office.