The first of the great German works during this period was "Hildebrandslied", a heroic pagan ballad about conflict between father and son. Written using alliterative verse, it was sung by minstrels before exalted audiences. Unfortunately it only survived in fragments.

Though called the Old High German Period, one of the greatest works during this period, "Heliand" (see below), was written in in old low German. In fact, most of the works of this period were not written in old high German, rather in Latin due to pressure from the church to reject the paganism of the time. Therefore a majority of the works produced during this time were by clergy or people otherwise associated with the church.

The first attempts of Teutonic church poetry are biblical epics, and the leader of the Teutonic Christ-singers is the Anglo-Saxon monk Caedmon of Whitby (formerly a swineherd), about 680, who reproduced in alliterative verse, as by inspiration, the biblical history of creation and redemption, and brought it home to the imagination and heart of Old England. This poem, which was probably brought to Germany by Bonifacius and other English missionaries, inspired in the ninth century a similar production of an unknown Saxon (Westphalian) monk, namely, a poetic gospel harmony or life of Christ under the title "Heliand" (i.e., Heiland, Healer, Saviour). About the same time (c. 870), Otfrid of Weissenburg in the Alsace, a Benedictine monk, educated at Fulda and St. Gall, versified the gospel history in the Alemannian dialect, in fifteen hundred verses, divided into stanzas, each stanza consisting of four rhymed lines.

(Above paragraph from: http://www.bible.org/docs/history/schaff/vol7/schaf152.htm)

This period saw the the first German woman author of literature, a nun named Hrotsvit of the cloister of Gandersheim in Saxony. Another example of literature by clergy was the "Song of Walter the Strong-Handed" written by a 10th century monk named Ekkehardus I. A century later, another monk named Ekkehardus IV improved the Latin epic.