A more thorough explanation:

CERATIUM

Ceratium is a historical term that refers to a duty on wax candles used in churches, usually paid twice a year. It is also known as wax scot or cerage.

An example of ceratium would be a tax paid by a church to the government for the use of wax candles during religious services. Another example would be a fee paid by a candle maker to the church for the right to sell their candles to the congregation.

These examples illustrate how ceratium was a way for the government or church to collect revenue from the use of wax candles in religious settings.