Passage: Because the health of the crown prince did not improve, Mackenzie advised him to go to Italy to undergo treatment. Frederick and Victoria went to San Remo in September 1887, causing outrage in Berlin because, despite the continued deterioration in the emperor's health, the couple didn't return to the capital. In early November, Frederick completely lost the use of speech and German doctors were summoned by Victoria to San Remo for further examinations. Finally, he was diagnosed with a malignant tumour and the only possible treatment was the removal of his larynx, but the crown prince refused. Victoria supported her husband in his decision, which caused a serious argument with her son William, who shortly before had arrived in Italy and accused his mother of being happy with Frederick's disease.In Berlin, the agony of William I lasted several months until, on 9 March 1888, the first German emperor finally died. His son succeeded him as king of Prussia and German emperor under the name of Frederick III.

Question: Who did not return to the capital, causing an uproar in Berlin?
Frederick and Victoria