Florida State Hospital (FSH) is a hospital and psychiatric hospital in Chattahoochee, Florida. Established in 1876, it was Florida's only state mental institution until 1947. It currently has a capacity of 1,042 patients. The hospital's current Administration Building is on the National Register of Historic Places. The facility's property previously served as a military arsenal during the Seminole Wars and the American Civil War, and later became the site of Florida's first state prison. It was subsequently refurbished as a mental hospital, originally known as Florida State Hospital for the Insane, which opened in 1876. It gained notoriety over the course of its long history. It was sued in O'Connor v. Donaldson, a case that went to the US Supreme Court, which ruled that the hospital had illegally confined one of its patients. The decision contributed to the deinstitutionalization movement, which resulted in changes to state laws and the closure of many public mental institutions in the country. The hospital today treats patients with severe mental disabilities who have been civilly or forensically committed to the institution. Early history The hospital campus was originally the site of the Apalachicola Arsenal, built in the 1830s and named after the nearby Apalachicola River. The hospital's current Administration Building was adapted from the original Officers' Quarters of the Arsenal and is listed on the National Register of Historic Places. The Arsenal facility served as a supply depot during the Seminole Wars. The first engagement of the American Civil War in Florida took place here on January 6, 1861 when a Confederate militia unit from Quincy overcame Union soldiers at the Arsenal. In 1868, Florida Governor Harrison Reed converted the arsenal property at Chattahoochee into Florida's first penitentiary. Florida's first recorded inmate was Calvin Williams, incarcerated in Chattahoochee in November 1868 for the crime of larceny and sentenced to one year. By 1869 there were 42 inmates and 14 guards. In 1871, the prison was put under civilian jurisdiction. Malachi Martin was appointed as warden, gaining a reputation for cruelty and corruption. He used prison labor for his personal benefit to build houses and tend his personal vineyards, amassing a huge fortune. The book The American Siberia, written in 1891, portrayed the Chattahoochee prison as a place of relentless barbarity. After the prisoners were relocated in 1876 to a prison at Raiford, Florida, the facility was adapted as a state hospital. Hospital In 1876,