Eleonore Freifrau von Keyserlingk, née Countess of Schlieben-Sanditten, was an 'Ehrendame' (lady of honour) to Queen Elisabeth Christine of Prussia, wife of King Frederick the Great. She was the daughter of the master of the hunt, 'Oberjägermeister' von Schlieben-Sanditten and she married in 1742 Dietrich Freiherr von Keyserlingk, a close friend of King Frederick the Great. On the occasion of the christening of their daughter Adelheid in 1744, the king was holding the child. After Keyserlingk's death in 1745, the king took care of the widow and the young child.
The present miniature is after a rectangular large-scale portrait by Antoine Pesne, circa 1740/42, now at Charlottenburg Castle, Berlin (see E. Berckenhagen et al., Antoine Pesne, Berlin, 1958, p. 152, no. 189, pl. 179).