The Settlers IV (), released as The Settlers: Fourth Edition in North America, is a real-time strategy video game with city-building elements, developed by Blue Byte and published by Ubi Soft. Released in Germany for Microsoft Windows in February 2001, in the United Kingdom in March, and in North America in August, it is the fourth game in The Settlers series, following The Settlers (1993), The Settlers II (1996) and The Settlers III (1998). In August, Blue Byte released an expansion, The Settlers IV Mission CD, featuring new single-player campaign missions, new maps for both single-player and multiplayer modes, a random map generator and map editor, gameplay improvements, and bug fixes. In December, they released a second expansion, The Settlers IV: The Trojans and the Elixir of Power (), containing new single-player campaigns, additional single and multiplayer maps, improved graphics, and additional gameplay tweaks. In March 2002, The Settlers IV: Gold Edition was released, containing the original game and both expansions, plus fan-made maps for multiplayer mode, and two minigames. In November 2009, Gameloft ported the original game to iOS, under the title The Settlers. Although featuring updated graphics and utilising touch controls, the gameplay, game mechanics and storyline are identical to the original. In April 2010, The Settlers was released for webOS, specifically optimised for the Palm Pre. Gameloft later released HD versions for iPad, bada, Symbian and Android. In 2013, the Gold Edition was released on GOG.com. In 2018, the game was re-released as The Settlers IV: History Edition. In the game's single-player campaign, the player controls three races (Romans, Vikings and Mayans) as they initially fight one another, before joining forces to combat the much greater threat posed to each of them by the exiled god Morbus, who has been banished to Earth after instigating a failed rebellion against the great god, HE. Unable to bear touching foliage, Morbus leads the mysterious Dark Tribe as he sets about attempting to erase all natural greenery from the planet's surface. The Trojans and the Elixir of Power takes place many centuries later, when the war against the Dark Tribe has faded from memory, and the three victorious civilisations have returned to fighting with one another. However, when Morbus once more proves a threat, attempting to permanently cure his allergy of greenery by creating a powerful elixir, it falls to the Trojans to unite the others, and stand against him