Former Pope Benedict XVI, the first pontiff in 600 years to resign, is seriously ill, a German newspaper reported on Monday.
The newspaper, Passauer Neue Presse, cited Benedict's biographer, German author Peter Seewald, who met the 93-year-old pope emeritus at the Vatican on Saturday.
A Holy See spokesperson had no comment on the report and the former pope's personal secretary, Archbishop Georg Ganswein, did not immediately return a call asking for comment.