For 10 points, name these ancient Celtic priests.
One work describes how these figures, which form a third class distinct from bards and vates, wore gold ornaments and had enough knowledge to stop an enemy's war. According to Diodorus the Sicilian, these peoples kill men and interpret their mode of falling and the blood flow to determine the future. A work by Tacitus describes these figures on the island of Mona holding up their hands to the sky while dressed in funeral garb. These figures were in charge of the wicker man sacrifice. Julius Caesar claims that these figures were exempt from military service to study divination in his Commentaries on the Gallic Wars. For 10 points, name these ancient Celtic priests.
One work describes how these figures, which form a third class distinct from bards and vates, wore gold ornaments and had enough knowledge to stop an enemy's war.
druids [prompt on Celts or Gauls ]