| Lady Katherine Grey | |
|---|---|
| Lady Herbert Countess of Hertford | |
 Miniature by Levina Teerlinc, c. 1560 | |
| Born | 25 August 1540 Bradgate Park, near Leicester |
| Died | 26 January 1568 (aged 27) Cockfield Hall, Yoxford, Suffolk |
| Burial | |
| Spouse | |
| Issue | Edward Seymour, Lord Beauchamp Thomas Seymour |
| House | Grey |
| Father | Henry Grey, 1st Duke of Suffolk |
| Mother | Lady Frances Brandon |
Katherine Seymour, Countess of Hertford (née Lady Katherine Grey; 25 August 1540 – 26 January 1568)[1][2] was a younger sister of Lady Jane Grey.
A granddaughter of Henry VIII's sister Mary, she emerged as a prospective successor to her cousin, Elizabeth I of England, before incurring Queen Elizabeth's wrath by secretly marrying Edward Seymour, 1st Earl of Hertford. Arrested after the Queen was informed of their clandestine marriage, Katherine (as Lady Hertford) lived in captivity until her death, having borne two sons in the Tower of London.
- ^ She signed her own name Katherine (see Leanda de Lisle's The Sisters Who Would be Queen)
- ^ The portrait of her is inscribed with "The La Kathe'/ Graye. / Wyfe of Therle of / Hertford" implying that was how her name was written.