Prince Philip was reportedly battling pancreatic cancer for eight years before his death, according to a royal author. Royal historian Hugo Vickers has revealed in his new book that the late Duke of Edinburgh was diagnosed with the disease in June 2013, when he was 91 years old. After his diagnosis, there were allegedly growing concerns that Philip would not be able to carry out royal duties. Despite this, the late prince continued to show up for official engagements for another four years,