The statues of the two Dioscuri tower over this plaza. But who were the Dioscuri, exactly? The twins Castor and Pollux, born from the union between the beautiful Leda and a swan (actually a transmogrified Zeus), are a pair of figures from Greek mythology. According to a popular version of the myth, only one of the two brothers, Pollux, inherited his father's gift of immortality: a privilege symbolised by the five-pointed star hovering above his statue's head in piazza Castello, identical to the one crowning the Angel/Lucifer in piazza Statuto.