This knight is, of course, Parzival, though how he came to be there is not explained.
Love was strong between Queen Condwiramurs and Parzival her husband.
Parzival started to follow the track of Cundries mule, which soon was lost, and with it the Grail was lost again.
Crossing a field and bridge where many a knight had fallen, Parzival reached a gate and knocked.
Little invention, properly so called, of incident can be traced in the Parzival.