Activities related to "reenactment" have a long history. The Romans staged recreations of famous battles within their amphitheaters as a form of public spectacle. In the Middle Ages, tournaments often reenacted historical themes from Ancient Rome or elsewhere. Military displays and mock battles and reenactments first became popular in 17th century England. In 1638, a staged battle between Christian and Muslim forces was enacted in London, and the Roundheads, flush from a series of victories during the Civil War, reenacted a recent battle at Blackheath in 1645, despite the ongoing conflict. It was in the nineteenth century that historical reenactments became widespread, reflecting the then intense romantic interest in the Middle Ages. Medieval culture was widely admired as an antidote to the modern enlightenment and industrial age. Plays and theatrical works  perpetuated the romanticism of knights, castles, feasts and tournaments. The Duke of Buckingham staged naval battles from the Napoleonic War on the large lake on his estate in 1821, and a reenactment of the Battle of Waterloo was put on for a public viewing at Astley's Amphitheatre in 1824. Historical reenactment came of age with the grand spectacle of the Eglinton Tournament of 1839, a reenactment of a medieval joust and revel held in Scotland, and organized by Archibald Montgomerie, 13th Earl of Eglinton. The Tournament was a deliberate act of Romanticism, and drew 100,000 spectators.
Which happened later, the reenactment of the Battle of Waterloo at Astley's Amphitheatre or the Eglinton Tournament of 1839?
the Eglinton Tournament of 1839