Possible Clues:

• Former tax on certain things requiring one's inspection for starters
• Old Roman tax
• For the month of Halloween, Irish king admits ordered to start tax on goods entering city
• Month before French king gets tax on goods brought into town
• Old king of France holding court imposed tax on goods
• Duty on goods entering a town
• Old means of taxation towards end of year on part of the island
• The French king found it so taxing after one month