The Apollo knot hairstyle had three essential parts: the front of the hair was combed into a center part; the long hair at the back was piled neatly in a bun on top of the head; and small ringlets fell beside the temples to frame the face. The style reflected the trend in the early nineteenth century to wear Greek-inspired dress styles and hair ornaments called sphendone and wreaths. Women either used their own hair or false hair pieces to create Apollo knots. Sometimes they decorated the front of their Apollo knots with decorative combs.
Laver, James. Costume and Fashion: A Concise History. 4th ed. London, England: Thames and Hudson, 2002.
Payne, Blanche, Geitel Winakor, and Jane Farrell-Beck. The History of Costume. 2nd ed. New York: HarperCollins, 1992.