The Ambraser Heldenbuch ("The Ambras Castle Book of Heroes") is a 16th-century manuscript written in Early New High German, now held in the Austrian National Library (signature Cod. ser. nova 2663). It contains a collection of 25 Middle High German courtly and heroic narratives along with some shorter works, all dating from the 12th and 13th centuries. For many of the texts it is the sole surviving source, which makes the manuscript highly significant for the history of German literature. The manuscript also attests to an enduring taste for the poetry of the MHG classical period among the upper classes. Source: Wikipedia (en)