Research the significance of purple and gold in war or as an accolade. Why would this phrase be used to describe Henry's deeds?

He basks in his accomplishments, and as he does, he is bathed "in purple and gold." This new color combination is used in its historical connotation of royalty. Henry has now become a hero. Without much fanfare, from himself or others, but still he seems to ascend ranks with these colors. Purple also represents blood flowing through the body and gold represents valour. The combination makes the colors an effective image of war and courage.