Then at the request of Queen Guenever and of King Bagdemagus Sir Launcelot came into the range, but he was disguised, and that was the cause that few folk knew him; and there met with him Sir Ector de Maris, his own brother, and either brake their spears upon other to their hands.  And then either gat another spear.  And then Sir Launcelot smote down Sir Ector de Maris, his own brother.  That saw Sir Bleoberis, and he smote Sir Launcelot such a buffet upon the helm that he wist not well where he was.  Then Sir Launcelot was wroth, and smote Sir Bleoberis so sore upon the helm that his head bowed down backward.  And he smote efte another buffet, that he avoided his saddle; and so he rode by, and thrust forth to the thickest.  When the king Northgalis saw Sir Ector and Bleoberis lie on the ground then was he wroth, for they came on his party against them of Surluse... (Le morte d'Arthur, Malory-Rhys, v.2, 1915)