Treaty of Wichale, Wichale also spelled Ucciali, (May 2, 1889), pact signed at Wichale, Ethiopia, by the Italians and Menilek II of Ethiopia, whereby Italy was granted the northern Ethiopian territories of Bogos, Hamasen, and Akale-Guzai (modern Eritrea and northern Tigray) in exchange for a sum of money and the provision of 30,000 muskets and 28 cannons.

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Article XVII of the Treaty of Wichale stated that the emperor of Ethiopia “could” have recourse to the good offices of the Italian government in his dealings with other foreign powers; but the Italian text of the treaty had the word “must.” Based on their own text, the Italians proclaimed a protectorate over Ethiopia. In September 1890, Menilek II repudiated their claim, and in 1893 he officially denounced the entire treaty. An attempt by the Italians to impose a protectorate over Ethiopia by force was finally confounded by their defeat at the Battle of Adwa on March 1, 1896. By the Treaty of Addis Ababa (Oct. 26, 1896), the country south of the Mareb and Muna rivers was restored to Ethiopia, and Italy acknowledged the absolute independence of Ethiopia.