Having at last rid himself of the crusaders, Tancred next confronted the threat from the north. In April 1191 in Rome, Henry and Constance were crowned emperor and empress by Pope Celestine III, and now the pair turned south to claim the Kingdom of Sicily. Constance accompanied her husband at the head of a substantial imperial army that descended into the Regno. The northern towns of the kingdom opened their gates to Henry, including the earliest Norman strongholds Capua and Aversa. Salerno, once Roger II's mainland capital, sent word ahead that Henry was welcome and invited Constance to stay in her father's old palace to escape the summer heat. Naples offered the first resistance of the whole campaign, withstanding a siege with the help of Margaritus of Brindisi's fleet, until much of the imperial army had succumbed to malaria and disease. Eventually the imperial army was forced to withdraw from the kingdom altogether. Constance remained in Salerno with a small garrison, as a sign that Henry would soon return.