Possible Clues:

• Weight of king or queen or other raised by king or queen
• Ancient Greek weight or silver coin
• Weight the queen added to overthrow of king, perhaps
• Unit of weight
• Old liquid measure
• One-eight of an ounce or fluid ounce
• In Athens, almost ready for a little liquid
• Eighth of fluid ounce
• A number of grains companion found in whisky?
• One eighth of a fluid ounce