 In order to test out his plans for a high school, on 1 May 1865, Bojsen rented a farmhouse in the village of Tjørnemarke a few kilometres north of Stege.On 26 July, he married Karen Anker, a Norwegian, and on 26 October he opened the school with some 30 students from the north of Falster and Møn.Given their initial success, Frede and Karen decided to build a proper school.