Template:Wp-Katherine FitzGerald, Viscountess Grandison

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Katherine FitzGerald, suo jure Viscountess Grandison (1660–1725), was a wealthy Irish heiress, being the only child of Sir John FitzGerald of Dromana, County Waterford. She inherited the Dromana estate in 1664 upon the death of her father. She was married three times; firstly to John Le Poer, 2nd Earl of Tyrone; secondly to Brigadier-General, Hon. Edward FitzGerald-Villiers; and thirdly and lastly to General William Steuart.

She was granted the rank of a Viscountess by Royal Warrant on 6 January 1700, and she died insane 25 years later.