Estates of the realm

Rico says that, what with the release of the new movie, The Fifth Estate ("a dramatic thriller, based on real events, that reveals the quest to expose the deceptions and corruptions of power that turned an Internet upstart into the 21st century's most fiercely debated organization"), he needed to remind himself, via Wikipedia, of what the other four are:

The estates of the realm were the broad social orders of the hierarchically conceived society, recognized in the Middle Ages and Early Modern period in Christian Europe. They are sometimes distinguished as the three estates: the clergy, the nobility, and commoners, and are often referred to by medieval ranking of importance (as the hierarchy was ordained by God) as the First, Second, and Third Estates respectively. In the scheme, God ordained the ministry, which was necessary to ordain the royalty and nobility, who settled privileges on the more prestigious commoners, or burghers (bourgeoisie). The term Fourth Estate emerged later, in reference to forces outside the established power structure, and is now most commonly used in reference to the independent press or media.