The Duke of Edinburgh spoke to his lawyers about suing Netflix over a false portrayal of him in The Crown.
Prince Philip consulted Farrer & Co, the law firm that has advised the royal family since the 1930s, after the series featured a plotline about the death of his older sister, Princess Cecilie.
The plot features in the penultimate episode of the second series, without a fictional disclaimer.
It includes imagined scenes whereby Cecile dies in a plane crash after the late Duke of Edinburgh was unable to travel to her in Germany.
While staying with the Queen and Philip, a close friend of the royal family said Philip had expressed anger and upset at his portrayal.