Sophie Montgomery
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| Portrayed by Lindsay Duncan | |
| Full Name | Sophie Montgomery, Marchioness of Eastborough |
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| Associated Noble House(s) | Marquessate of Eastborough |
| Date of Birth | |
| Father | Sir Jacob Walsom |
| Father's Rank | Baronet |
| Mother | Lady Mary Walsom |
| Mother's Rank | Peerage |
| Town Residence | {{{residence}}} |
| Year of Debut | 1782 |
| Dowry | |
| Year of Marriage | 1783 |
| Spouse | Rawdon Montgomery III |
| Spouse's Rank | Marquess |
| Issue | Mirabel O'Sullivan, Rawdon Montgomery, Ivor Montgomery |