Significance of Chestnuts for Ambrosius

Artos races out to get some chestnuts for Ambrosius when they are hunting in Spain. Artos knows that this will be Ambrosius' last hunt, and that possibly Ambrosius will die while on the hunt. He wants his last experience to be eventful and happy. However, the chestnuts also represent the small seed of something larger. Ambrosius hands the first roasted chestnut to Artos, thereby suggesting that the is not only planting the idea in Artos's mind that he be the next High King, but that Artos accept this mantle from him.