Possibly in use as early as the 4th Century BC, The Roman Military Award of The "Gold Crown" was considered higher than all previous Crown Award Head Pieces. It was given as a reward to only Centurions and related High Ranking Roman Officers. The criteria for award involved an Officer who engaged and Enemy in direct hand to hand combat, and defeated him. Further, the Officers cannot "retreat or leave The Field". It is from this Act, the term "To Stand One's Ground", developed.
The Crown was normally awarded by The Emperor or his Designate. Made of thin, wrought Gold sheaves, they were shaped into plant leaves. The grouping of leaves,was then attached to a thin Gold wire, fashioned into a Crown. It could be worn during Parades or Official Ceremonies. The Crown was also considered a "financial reward", due to the cost (it's value). Later, The Gold Crown would be adopted by Roman Emperors (although they did have these own "official" Crown). The Act was thought to attempt to portray The Emperor as a "fierce" Warrior.