The Anglo-Ethiopian Treaty of 1902 was designed to determine the frontier between the Sudan and Ethiopia. In an annex to this treaty the British, Italian, and Ethiopian Governments embodied a number of agreed modifications to the frontier between the Sudan and Eritrea (Italy's colonia primogenita) as well as to that between Ethiopia and Eritrea. While the latter survived until the Italo-Ethiopian war of 1935–6 (and was re-established, in substance, by the British Military Administration in 1941 subsisting until the Ethiopian-Eritrean federation in 1952), the Sudan-Ethiopian frontier has remained substantially unchanged to the present day. The treaty was the culmination of protracted negotiations between the Emperor Menelik and the British Agent in Ethiopia, Lt.-Col. J. L. Harrington.