The modus vivendi of Acroma was a pair of agreements signed by the Sanūsī Order with Britain and Italy on 16 April 1917 at Acroma (ʿAkrama). The negotiations that led to the modus vivendi were begun by Idrīs al-Sanūsī soon after he succeeded his uncle at the head of the order in 1917. His cousin, Aḥmad al-Sharīf al-Sanūsī, had instigated an unsuccessful war with Britain with Ottoman and German assistance at the height of the First World War. Idrīs wished to enter into negotiations with Britain, but the British refused to negotiate unless their wartime ally, Italy, was included in the talks. Peace with Italy was more than al-Sharīf could bear and he left Libya for the Ottoman Empire when negotiations were opened.