According to a royal biographer, Prince Philip is "very, very disappointed" by Meghan Markle's failure to "support the monarchy" and Prince Harry.
The 99-year-old Duke was well known to have given up his career in the navy in 1952 to support the Queen when she took the throne.
Philip is said to have been irritated that the Duchess of Sussex failed to do the same.
Ingrid Seward, speaking to Sky New, said Philip couldn't understand why the former actress didn't follow his example when she married Prince Harry in May 2018.