A few months ago I read a NY Times about the upcoming miniseries Rome, and in the article the writer was talking about the set and props. Here is the relevant paragraph, "Her research also showed that Roman soldiers sometimes affixed small parts of vanquished rivals' bodies, not excluding genitals, to their battle helmets. Ms. Ferry's costumes reproduce this, but when she tried one recent afternoon to find an example, the helmets nearby dangled only fake fingers; the faux phalluses were nowhere to be found."

I thought it was interesting though I had never read anything on the practice. Do we know that they did in fact do this? Just curious, though of course no mention of the taking of grisly war trophies wouldn't prove that it didn't happen. Whether or not it is recorded by history I suspect the taking of such trophies is probably as old as war itself.