Evidence that the Roman Catholic Church was not allowed to preach Roman Catholicism in Ethiopia during the reign of Menelik II:

 

Treaty of friendship and commerce signed in Ancober, between the representative of the King of Italy and Menelik II, King of Scioa, on May 21, 1983:

 Article 5. In both States, the faculty for subjects of the other country to practice their religion is fully guaranteed. However, it is forbidden in Scioa to teach any religion other than Christian (Ed. Ethiopian Orthodox Tewahido) practiced by the King (Ed. Menelik II)

Then Leonard Mosley in his biography of Haile Selassie, about a British missionaries in Ethiopia in 1897, wrote:

"They visited the head of the Roman Catholic Mission, Monseigneur Thaurin, and watched a class at which the monks were schooling the sons of Ethiopian nobleman. They did not know it, but one of the pupils was Makonnen's son, Lij Tafari, and his elder step-brother, Yilma. Monseigneur Thaurin complained (not the first or last missionary to do so in Ethiopia) that he was allows to teach but not to preach."

@Bro.Yo-Seyf