Cato's Letters

Cato's Letters were essays by British writers John Trenchard and Thomas Gordon, first published from 1720 to 1723 under the pseudonym of Cato (95–46 BC), the implacable foe of Julius Caesar and a famously stubborn champion of republican principles.

Purpose
The Letters are considered a seminal work in the tradition of the Commonwealth men. The 144 essays were published originally in the London Journal, later in the British Journal. The purpose was to help get the freedom of speech.

Publication
The Letters were collected and printed as Essays on Liberty, Civil and Religious. A measure of their influence is attested by six editions printed by 1755. A generation later their arguments immensely influenced the ideals of the American Revolution; it is estimated that half the private libraries in the American colonies held bound volumes of Cato's Letters on their shelves.

Later unrelated antithetic usage
Cato was used as a pseudonym by the Reverend Dr. William Smith, the most influential preacher in Philadelphia, in a series of essays arguing against American independence in the Pennsylvania Gazette published April of 1776.

Cato was later appropriated as a pseudonym in a series of letters to the New York Journal in 1787 and 1788 opposing James Madison's views and urging against ratification of the U.S. Constitution. Many historians attribute these letters to George Clinton, though their authorship has not been definitively proven. These letters are unrelated to the Trenchard and Gordon letters.

Influence
These letters also provided inspiration and ideals for the American Revolutionary generation. The essays were distributed widely across the thirteen colonies, and frequently quoted in newspapers from Boston to Savannah. Renowned historian Clinton Rossiter stated "no one can spend any time on the newspapers, library inventories, and pamphlets of colonial America without realizing that Cato's Letters rather than John Locke's Civil Government was the most popular, quotable, esteemed source for political ideas in the colonial period."

The Cato Institute, a Washington, D.C., think tank founded by Edward H. Crane in 1977, takes its name from Cato's Letters.