Oscar Moncrieff
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| Portrayed by Ralph Fiennes | |
| Full Name | Oscar Randall Moncrieff |
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| Title | Marquess of Avening |
| Associated Noble House(s) | Marquessate of Avening |
| Date of Birth | November 30, 1774 |
| Father | Roland Moncrieff (deceased) |
| Father's Rank | Marquess of Avening |
| Mother | Amelia Moncrieff (deceased) |
| Mother's Rank | Marchioness of Avening |
| Town Residence | {{{residence}}} |
| Income | £ |
| School | Westminster |
| University | Cambridge (Trinity College) |
| Year Attained Title | 1803 |