Dowager Countess of Erroll, died in Edinburgh.

London Evening Standard, 17 Jan 1856, page 2:
DEATH OF THE COUNTESS DOWAGER OF ERROLL
We regret to announce the death of the Countess Dowager of Erroll, daughter of the late King William IV and Ms Jordan. The melancholy event took place at five minutes to eleven o'clock yesterday forenoon at Edinburgh, being at the time her ladyship was on her way south to hasten to the sick bed of her brother, Lord Adolphus Fitzclarence.

The deceased countess had left Mr J. Duff, M.P., and Lady Agnes Duff's seat in the north of Scotland, and on Saturday last stayed at Wemyss Castle, Dysart, and reached Edinburgh on Tuesday, where her ladyship was taken very unwell. The symptoms became alarming, and Lady Mary Fox, and the other relatives, received a telegraphic message early on Monday morning, conveying the intelligence that the countess was lying in a very dangerous state. Lady Mary Fox left town by the express train on Tuesday evening, and had the consolation of being with her sister at her dissolution, which happened at the hour before named without any apparent paint. We believe the countess died from congestion of the brain. Lady Augustus Fitzclarence, her sister-in-law, and Lady Agnes Duff were, among the other members of the family, present at her death, and the Earl of Erroll and Viscount and Viscountess Campden were also sent for when her ladyship was considered in imminent danger.

The deceased countess was third daughter of the late King William IV and Mrs Jordan, and was born Jan. 18, 1801. Her ladyship married Dec. 4, 1820, William George, 17th Earl of Erroll, who died in April, 1846, and by whom her ladyship leaves issue the present Earl of Erroll, Lady Campden, Lady Agnes Duff, and Lady Alice Hay, unmarried.

Major General Fox left town yesterday on receipt of the distressing news.