 In 1613-1614, Johann and his brothers, with his guardians, took a tour of France, Great Britain and the Netherlands as part of their studies.In 1615 Johann Ernst reached adulthood and took control of his duchy and the guardianship of his under-age younger brothers.On 24 August 1617 in the Schloss Hornstein (now Wilhelmsburg Castle), during his mother's funeral, Johann Ernst created The Fruitbearing Society ("Fruchtbringende Gesellschaft"), a German literary society.