Andreae's ›Christianopolis‹ is the most important utopia of Protestant theology. It shows the model state of spiritual republicanism, the secular goal of Protestant political theology. Universal education, spiritual disciplining and welfare policies were to be combined in a second Reformation. Andreae's theological-political vision became a model of the Protestant princely states as well as of English revolutionary republicanism in the 17th century. The allegorical and polemical didactic poem ›Christenburg‹, written in 1626, sees the vision as being critically endangered and shows the extent to which the Protestants' situation had deteriorated in the Thirty Years' War.