The title of Baron Castle Durrow, in the County of Kilkenny, had been created in the Peerage of Ireland in 1733 for his father William Flower.

He was a Colonel in the Army and also represented County Kilkenny and Portarlington in the Irish House of Commons.

He was praised by Jonathan Swift as "a gentleman of very great sense and wit".

As of 2022[update], the titles are held by the eleventh Viscount, who succeeded his father in 1995.

[1] Until 1922, the principal seat of the family was Castle Durrow, near Durrow, County Kilkenny; in England they also owned Beaumont Lodge, near Old Windsor, Berkshire,[2] and the manor of Shellingford in Shellingford, Berkshire (presently Oxfordshire).