A liberty pole is a tall wooden pole, often used as a type of flagstaff, planted in the ground, surmounted by a Phrygian cap. The symbol originated in the immediate aftermath of the assassination of Roman dictator Julius Caesar by a group of Rome's Senators in 44 BC. Immediately after Caesar was killed, the leaders of the assassination plot went to meet a crowd of Romans at the Roman Forum; a pileus (a kind of skullcap that identified a freed slave) was placed atop a pole to symbolize that the Roman people had been freed from the rule of Caesar, which the assassins claimed had become a tyranny because it overstepped the authority of the Senate and thus betrayed the Republic. During the French revolution, the Roman pileus was confused with the Phrygian cap, and this mis-identification then led to the use of the Phrygian cap as a symbol of republicanism.
Liberty poles were often erected in town squares in the years before and during the American Revolution (e.g. Concord, Massachusetts; Newport, Rhode Island; Caughnawaga, New York; Savannah, Georgia and Englewood, New Jersey). Some colonists erected liberty poles on their own private land (such as in Bedford, Massachusetts since 1964 and Woburn, Massachusetts—the pole raising there is reenacted annually). An often violent struggle over liberty poles erected by the Sons of Liberty in New York City raged for 10 years. The poles were periodically destroyed by the royal authorities (see the Battle of Golden Hill), only to be replaced by the Sons with new ones. The conflict lasted from the repeal of the Stamp Act in 1766 until the revolutionary New York Provincial Congress came to power in 1775. The liberty pole in New York City had been crowned with a gilt vane bearing the single word, "Liberty".