In honor of what would have been his late mother's 85th birthday, Charles Spencer, Princess Diana's brother, shared a rare portrait on Instagram.

The 9th Earl Spencer shared the beautiful painting of his mother, Frances Shand Kydd, and wrote, "My mother—on this, her 85th birthday. She was born in Sandringham, Norfolk, on the very same day that King George V died—in the same parish. She died 3 days after the 50th anniversary of her marriage to my father. This portrait is to be found in the Library at @althorphouse."