A good example is the treatment of Arthur or Artorios, a character whose historical existence is still debated. Unlike Ambrosius Aurelianus, Artorios is a minor character who never appears directly but Duggan provides a rare perspective of this figure from the Saxon side. Here he is a former soldier from the Byzantine army leading a band of mercenary cataphractarii or heavy cavalry who fight for the surviving Roman-British kingdoms. Their impact is huge compared to numbers but they require horses large enough to carry an armoured man; when the horses die out, this strategic advantage disappears. Duggan's approach was the basis for the plot of the 2004 film King Arthur, cited in its publicity as being based on 'the latest historical research.'