In which month of 1789 did the National Constituent Assembly officially pass the decree abolishing the feudal system and privileges in France?

In late 18th-century French society, what was the tax levied by the Church, comprising one-tenth of the agricultural produce, called?

When was the inauguration session of the Estates-General of 1789 held in France?

In which year was the 'Livre', the unit of currency in France, discontinued?