Question: The British Mandate for Palestine was finally confirmed in 1922, the civil Mandate administration was formalized with the League of Nations' consent in 1923 following the ratification of which peace treaty signed in Palais de Rumine?
Sentence (from "List of massacres in Palestine"): For massacres that took place during the 1948 Palestine War, see Killings and massacres during the 1948 Palestine War.
Relevant evidence: No