Question: When is Agnes Duff, Countess Fife's mother's birthday?
Sentence (from "Elizabeth Hay, Countess of Erroll"): Elizabeth Hay, Countess of Erroll (17 January 1801 – 16 January 1856; born Elizabeth FitzClarence) was an illegitimate daughter of King William IV of the United Kingdom and Dorothea Jordan.
Relevant evidence: Yes