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".
History of Hebrew grammar
Solomon ibn Gabirol in the 11th century composed a versified Hebrew grammar, consisting of 400 verses divided into ten parts. In the 12th century, Ibn Barun compared the Hebrew language with Arabic in the Islamic grammatical tradition.
11th to 12th century grammarians of the Golden age of Jewish culture in Spain included Judah ben David Hayyuj, Jonah ibn Janah, Abraham ibn Ezra, Joseph Kimhi, Moses Kimhi and David Kimhi. Ibn Ezra gives a list of the oldest Hebrew grammarians in the introduction to his "Moznayim" (1140).
Roger Bacon was "a tolerable Hebrew scholar". Profiat Duran published an influential grammar in 1403.