Mirabelle Delafield
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| Portrayed by Emily Berrington | |
| Full Name | Mirabelle Cecilia Delafield |
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| Associated Noble House(s) | Marquessate of Hollomere, Earldom of Thernope |
| Date of Birth | 3rd January, 1790 |
| Father | John Seymour, Earl of Thernope |
| Father's Rank | Earl of Thernope |
| Mother | Dorothy Seymour nee Sharpe |
| Mother's Rank | Countess of Thernope |
| Town Residence | {{{residence}}} |
| Year of Debut | 1807 |
| Dowry | |
| Year of Marriage | 1808 |
| Spouse | Charles Delafield |
| Spouse's Rank | Marquess of Hollomere |
| Issue | Christian Delafield, b. 1709 and Anne Delafield, b.1709 |