In 1878, an engineer from Thurgau named Alfred Ilg was appointed by Emperor Menelik II as an advisor. Ilg exerted considerable influence on the country's foreign policy and facilitated the construction of a railway line between Addis Ababa and Djibouti, which contributed to the development of the Ethiopian capital.
In 1933, Switzerland and Ethiopia signed a friendship and trade treaty. Relations between the two countries developed more actively after the Italo-Ethiopian war and the Second World War. Switzerland opened a diplomatic mission in Addis Ababa in 1955, before making it an embassy in 1962.
Ethiopia, historical Dictionary of Switzerland
Diplomatic Documents of Switzerland, Dodis