Althochdeutsch
The Old High German dialect was different because it was the written classical Church Latin and spoken Alemanni German. The interface was the resultant language. The Old High German Period was from 800-1050AD. The Old High German spoken language was first written in Classical and Church Latin, was preserved years after the period. The Latin written language was used by the Roman Catholic Church to enhance the suppression of paganism and spread Christianity. Old High German was derived from Latin. 350.