Gwendolyn Moncrieff
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| Portrayed by Rosamund Pike | |
| Full Name | Gwendolyn Lillian Moncrieff |
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| Associated Noble House(s) | Marquessate of Avening |
| Date of Birth | May 3, 1790 |
| Father | Roland Moncrieff (deceased) |
| Father's Rank | Marquess of Avening |
| Mother | Amelia Moncrieff (deceased) |
| Mother's Rank | Marchioness of Avening |
| Town Residence | {{{residence}}} |
| Year of Debut | 1809 |
| Dowry | £35,000 |