The first estate was made up of the religious leaders who were in charge of the Church. While these individuals made up only 1% of the total population, they controlled almost 10% of the land in France. This land brought them a great deal of wealth from the products produced on it and in the form of rent from peasants.
Those who belonged to this estate also received a tithing, or tax of 10% of all the earnings of those who lived on their land. This tithing was supposed to be utilized to run the Church. However, it was often used to fund the extravagant lifestyles of those who belonged to the first estate.
The trick is growing up without growing old.
To raise public revenue, Emperor Vespasian--who built the Colosseum--was the first to introduce pay toilets in the city of Rome.