1786, Francis Grose, A Treatise on Ancient Armour and Weapons, p.52:
One is a large ball of iron, fastened with three chains to a strong truncheon or staff of about two feet long; the other is of mixed metal, in the form of a channelled melon, fastened also to a staff by a triple chain; these balls weigh eight pounds.
1604, William Shakespeare, Measure for Measure, Act II, Scene II, l.60:
Not the king's crown, nor the deputed sword / The marshal's truncheon, nor the judge's robe / Become them with one half so good a grace / As mercy does.