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In 1718, Ulrika Eleonora was crowned Queen of Sweden. The eldest child of King Charles XI, Ulrika Eleonora had previously served as regent for her brother, King Charles XII, who was absent from Sweden due to his military campaigns. After Charles XII died without heirs in 1718, Ulrika Eleonora was elected queen by the Riksdag, Sweden's parliament, with her husband, Frederick, as her co-ruler.