Semitic languages
The similarity of the Hebrew, Arabic and Aramaic languages was accepted by Jewish and Islamic scholars since medieval times. The languages were familiar to Western European scholars due to historical contact with neighbouring Near Eastern countries and through Biblical studies, and a comparative analysis of Hebrew, Arabic, and Aramaic was published in Latin in 1538 by Guillaume Postel. Almost two centuries later, Hiob Ludolf described the similarities between these three languages and the Ethiopian Semitic languages. However, neither scholar named this grouping as "Semitic".
Beta Israel
The sources of De Almeida's knowledge are not spelled out, but they at least reflect contemporary views. His comments regarding the Hebrew knowledge of the Beta Israel of that time is very significant: it could not have come from recent intercourse with Jews elsewhere, so it indicates deep antiquity to Beta Israel traditions, at least at that time, before their literature was taken away from them and demolished by the later conquering Christians. (The more sceptical school of historians, whose views are discussed above, deny that the Ethiopian Jews ever knew Hebrew; they certainly have no Hebrew texts remaining, and have been forced in recent centuries to use the Christian "Old Testament" in Ge'ez after their own literature was destroyed.) It is also of interest that he mentions more Jewish communities dwelling beyond Ethiopia in the Sudan. As so often in such medieval hearsay accounts, however, loose claims are made that may not be accurate. The Beta Israel were not predominantly of the Arabic race, for instance, but he may have meant the term loosely or meant that they also knew Arabic.