a man’s home is his castle

A proverbial expression that illustrates the principle of individual privacy, which is fundamental to the American system of government. In this regard, the Fourth Amendment to the United States Constitution — part of the Bill of Rights — prohibits “unreasonable searches and seizures.” (See also under “Proverbs.”)

People enjoy the position of rulers in their own homes, and others have no right to enter without the householder’s permission.