The First Treaty of Brömsebro was agreed upon in September 1541.
 It was an agreement between the two arch enemies Denmark-Norway and Sweden.
 The kings of the two countries, Christian III and Gustav I respectively, took part of the negotiations that took place in Brömsebro, a village on the border between the countries.
 The treaty would run for 50 years and with the treaty, Denmark-Norway and Sweden agreed upon a joined attitude against the Hanseatic League.
 The parties also committed to providing support when the other country was attacked by domestic or foreign enemies, which meant that Danish troops, for example, helped the Swedish king Gustav to suppress a peasant uprising (the Dacke War) the following years.
Maximilian II (31 July 1527 – 12 October 1576), a member of the Austrian House of Habsburg, was Holy Roman Emperor from 1564 until his death.
 He was crowned King of Bohemia in Prague on 14 May 1562 and elected King of Germany (King of the Romans) on 24 November 1562.
 On 8 September 1563 he was crowned King of Hungary and Croatia in the Hungarian capital Pressburg (Pozsony in Hungarian; now Bratislava, Slovakia).
 On 25 July 1564 he succeeded his father Ferdinand I as ruler of the Holy Roman Empire.
Alexander Lo (born Luo Chang-An) is a former taekwondo champion from Taiwan, who has great physical skills.
 Alexander worked on many films during the 1980s about Ninjas, such as The Ninja Hunter, The Super Ninja, Ninja vs. Shaolin, Ninja Condors 13, and Mafia vs. Ninja.
 He also worked on Shaolin films such as Shaolin Chastity Kung Fu and the famous Shaolin vs. Lama.
 The director who Lo most frequently worked with is Robert Tai, who in 1984 directed him in a nine-hour epic titled (redubbed and released in 1999 as "Shaolin Dolemite".
 Some time after that film, Alexander quit acting but did not stop making movies.
 He continued a long partnership with Robert Tai, only this time as an action choreographer, working on such films as Fists of Legends II.
 He often collaborated with his good friend, the African-American kick-boxer Eugene Thomas (Trammell), where they either fought together as a black/Asian duo, or faced up against each other as arch enemies.
Space Ghost's Musical Bar-B-Que is the first of two commercially available Cartoon Planet soundtrack albums, the second being Space Ghost's Surf & Turf.
 Featuring songs and skits by Space Ghost and his arch enemies Zorak and Brak.
Space Ghost's Surf & Turf is the second of two commercially available "Cartoon Planet" soundtrack albums, the first being Space Ghost's Musical Bar-B-Que.
 Featuring songs and skits by Space Ghost and his former arch enemies Zorak and Brak.
The Sandfleas are a fictional gang of masked hooligans within the mythology of the superhero-themed American comedy band The Aquabats, who featured prominently as the latter's "arch enemies" in their stage shows and related media during the late 1990s.
Ageltrude (also spelled Agiltrude) (died 27 August 923) was the Empress and Queen of Italy as wife and mother respectively of Guy (reigned 891–94) and Lambert (reigned 894–98).
 She was the regent for her son and actively encouraged him in opposing her archenemies, the Carolingians, and in influencing papal elections in their favour.
Solomon, also Salomon (Hungarian: "Salamon" ; 1053 – 1087) was King of Hungary from 1063.
 Being the elder son of Andrew I, he was crowned king in his father's lifetime in 1057 or 1058.
 However, he was forced to flee from Hungary after his uncle, Béla I, dethroned Andrew in 1060.
 Assisted by German troops, Solomon returned and was again crowned king in 1063.
 On this occasion he married Judith, sister of Henry IV, Holy Roman Emperor.
 In the following year he reached an agreement with his cousins, the three sons of Béla I. Géza, Ladislaus and Lampert acknowledged Solomon's rule, but in exchange received one-third of the kingdom as a separate duchy.
Iron Butterfly is an American rock band best known for the 1968 hit "In-A-Gadda-Da-Vida", providing a dramatic sound that led the way towards the development of hard rock and heavy metal music.
 Formed in San Diego, California, among band members who used to be "arch enemies", their heyday was the late 1960s, but the band has been reincarnated with various members with varying levels of success, with no new recordings since 1975.
 The band's seminal 1968 album "In-A-Gadda-Da-Vida" is among the world's 40 best-selling albums, selling more than 30 million copies.
 Iron Butterfly is also notable for being the first group to receive an RIAA platinum award.
Guy of Spoleto (died 12 December 894), sometimes known by the Italian version of his name, "Guido", or by the German version, "Wido", was the Margrave of Camerino from 880 (as Guy I or Guy II) and then Duke of Spoleto and Camerino (as Guy III) from 883.
 He was crowned King of Italy in 889 and Holy Roman Emperor in 891.
 He died in 894 while fighting for control of the Italian peninsula.

Question: Who was the arch enemies of the man crowned King of Italy in 889?
Answer: the Carolingians