What is "libertatia"

Libertatia (also known as Libertalia) was a possibly fictional anarchist colony founded in the late 17th century in Madagascar by pirates under the leadership of Captain Henry Avery. Whether or not Libertatia actually existed is disputed. It is described in the book A General History of the Pyrates by Captain Charles Johnson, an otherwise unknown individual who may have been a pseudonym of Daniel Defoe. Much of the book is a mixture of fact and fiction, and it is possible the account of Libertatia is entirely fabricated. According to Johnson's description, Libertatia lasted for about 25 years. The precise location is not known, however, most sources say it stretched from the Antongil Bay to Mananjary, Fianarantsoa, including Île Sainte-Marie and Mahavelona. Thomas Tew, Misson and Henry Avery were involved in founding it.