Sarah Ferguson remembered the late Queen Elizabeth on Sunday, on what would have been the royals 98th birthday.

Thank you for all that you have taught us, for being a steadfast leader and dear friend. You are sorely missed, the Duchess of York said in a post on Instagram. Fergie was off on the monarchs age by just a year, writing that she wouldve been 97 not 98.

The queen was born Elizabeth Alexandra Mary in London on April 21, 1926.