A castle in Sussex which Malory identifies as
a castle that is called Magouns, and now it is called Arundel, in Sussex.
The constable of Magouns, Berengier, a vassal of Angledis's father, Ranner, watched over the lady and her son (Berengier was also Angledis' cousin). Alexander was raised here until he became a knight.
Traitorous knights within the castle told Mark of Alexander's existence, however, and later helped Mark in his plots to murder Tristan.