The Augustan settlement built upon a cultural shift in Roman society. In the middle Republican era, even Scipio's tentative hints that he might be Jupiter's special protege sat ill with his colleagues. Politicians of the later Republic were less equivocal; both Sulla and Pompey claimed special relationships with Venus. Julius Caesar went further, and claimed her as his ancestress. Such claims suggested personal character and policy as divinely inspired; an appointment to priesthood offered divine validation. In 63 BC, Julius Caesar's appointment as pontifex maximus "signaled his emergence as a major player in Roman politics". Likewise, political candidates could sponsor temples, priesthoods and the immensely popular, spectacular public ludi and munera whose provision became increasingly indispensable to the factional politics of the Late Republic. Under the principate, such opportunities were limited by law; priestly and political power were consolidated in the person of the princeps ("first citizen").

Answer this question, if possible (if impossible, reply "unanswerable"): In what year was Cesar made pontifex maximus?
63 BC