Greenwich is a borough (formed in 1965) in South East London that takes its name from the historic town of Greenwich. It is the site of the Royal Observatory (founded in 1675), after which the Greenwich Meridian (0° longitude) and Greenwich Mean Time are named. Greenwich was the site of the Palace of Placentia, the birthplace of Henry VIII and Elizabeth I. After the Civil War, Christopher Wren rebuilt the palace as the Royal Naval Hospital for Sailors. These buildings became the Royal Naval College in 1873 and remained an establishment for military education until 1998.