 Sibbern and Møller were both philosophers who also wrote fiction. The latter in particular had a great influence on Kierkegaard’s philosophico-literary development. Martensen also had a profound effect on Kierkegaard, but largely in a negative manner. Martensen was a champion of Hegelianism, and when he became Bishop Primate of the Danish People’s Church, Kierkegaard published a vitriolic attack on Martensen’s theological views. Kierkegaard’s brother Peter, on the other hand, was an adherent of Martensen and himself became a bishop. Kierkegaard regarded Martensen as one of his chief intellectual rivals. Martensen was only five years his senior, but was already lecturing at Copenhagen University when Kierkegaard was a student there. Martensen also anticipated Kierkegaard’s first major literary project, by publishing a book on Faust. Kierkegaard, who had been working up a project on the three great medieval figures of Don Juan, Faust and Ahasuerus (the wandering Jew), abandoned his own project when Martensen’s book appeared, although he later incorporated much of the work he had done into Either/Or. 