page 145 of 960 of Sir Thomas Malory: Le Morte Darthur: The Definitive Original Text Edition

145:

Ah, the worst book in the whole Mort. This was an experimental book on Malory’s part because he kept the original alliteration from the sources and it reads … awful. This whole book is a slog to get through. Anyway, enter Lancelot and Trystams, and enter a messenger from the Emperor Lucius (in Rome) who wants tribute from Arthur.