“From what stars have we fallen together here?” Nietzsche exclaimed when he met the 21-year-old Lou Andreas-Salome in St Peter’s Basilica, Rome, along with another philosopher Paul Ree. Nietzsche and Ree were friends. Now Salome joined them in what she called a “Holy Trinity.” If there ever was a cataclysmic love-at-first-sight of cosmic proportions, it was this. Nietzsche proposed to Salome twice, first through Ree and then personally. Both proposals were re...