Diodorus Siculus, in his 1st-century History had this to say about Celtic head-hunting: "They cut off the heads of enemies slain in battle and attach them to the necks of their horses. The blood-stained spoils they hand over to their attendants and striking up a paean and singing a song of victory; and they nail up these first fruits upon their houses, just as do those who lay low wild animals in certain kinds of hunting. They embalm in cedar oil the heads of the most distinguished enemies, and preserve them carefully in a chest, and display them with pride to strangers, saying that for this head one of their ancestors, or his father, or the man himself, refused the offer of a large sum of money. They say that some of them boast that they refused the weight of the head in gold." Yea, so probably not diplomat. After reading some of their history they were both expansionists and conquerors. Either one would suit them better than diplomat (at least pre-modern celts).