Short answers, pulled from the story.
The Geatish Society formed in 1811 to raise the moral tone of society through contemplating Scandinavian antiquity. Members sought to revive Viking spirit during a time of contentious debate over Norse mythology as subjects of high art.
Esaias Tegnér and Erik Gustaf Geijer served as editors of Iduna while producing famous epic poems under the society's influence. The club used this platform to disseminate poetry, translations of Edda sagas, and their views on old Icelandic literature.
Members of the Geatish Society would occasionally wear horned helmets during events which became the source of the myth that Vikings wore such headgear. There is no evidence to suggest they ever did wear these items historically despite the romanticized descriptions written by members.
In 1844 following the death of Jakob Adlerbeth the Society formally dissolved after being dormant for more than ten years. Part of the library accumulated by the Götiska förbundet together with its archive was given to the library of the Royal Swedish Academy of Letters History and Antiquities.
The Geatish Society challenged prevailing neoclassical academic prejudices that favored Biblical and Classical subjects over Norse mythology for high art. In 1817 the organization announced a competition for sculpture on Nordic themes to further their cause against established academic norms.