Which preposition to use with icelandic

in Occurrences 1%

RASK, RASMUS CHRISTIAN, Danish philologist, born near Odense; studied first the primitive languages of the North, chiefly Icelandic, and then those of the East, and published the results of his researches both by his writings and as professor of Oriental Languages and of Icelandic in the university of Copenhagen (1787-1832).

Which preposition to use with  icelandic