Catherine McAvoy
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| Portrayed by Keeley Hawes | |
| Full Name | Catherine McAvoy, Dowager Countess of Kirkfries |
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| Associated Noble House(s) | Earldom Parry, Barony Loseley, Earldom of Kirkfries |
| Date of Birth | 18th March 1781 |
| Father | Henry Layton I |
| Father's Rank | Earl |
| Mother | Louisa Layton |
| Mother's Rank | Dowager Countess |
| Town Residence | {{{residence}}} |
| Year of Debut | 1798 |
| Dowry | £40,000 |
| Year of Marriage | 1798 |
| Spouse | Godfrey McAvoy, Lord Kirkfries |
| Spouse's Rank | Earl |
| Year of Widowhood | 1800 |
| Issue | None |