Art: Hal Foster and John Cullen Murphy (from page 2150, April 23, 1978). At this point in Prince Valiant's run, John Cullen Murphy, who had been quietly assisting Hal Foster since 1970, was well into his first decade of drawing the strip over Foster's writing and roughs.
Source: Prince Valiant (Vol. 48): Return to Camelot, comprising pages, or installments, 2124 (October 23, 1977) through 2167 (August 20, 1978). Fantagraphics Books, 2003.