How did Rome have the greatest affect on Martin Luther in Driven to Defiance?

In "Driven to Defiance," Rome significantly impacted Martin Luther by embodying the corruption and excesses of the Catholic Church, which fueled his desire for reform. The practices of indulgences and the Church's wealth contrasted sharply with Luther's growing belief in salvation through faith alone. This disillusionment with Rome's authority and moral failings galvanized Luther's resolve to challenge the Church, ultimately leading to the Protestant Reformation. His experiences in Rome deepened his conviction that a return to a more authentic Christianity was necessary.