The Legend of Prince Valiant

The body of Dylan, elder son of the exiled Sinnin, is brought to Camelot by a man who swears he saw Valiant commit the murder. On the corpse is a message from Sinnin asking his other son Dennis to come back to the family and make a fresh start. King Arthur, Merlin, and Dennis all have their doubts about the picture that is being presented before them. Yet with Dylan's lifeless body right there and Valiant not present to deny the charges, what other explanation can there be?