Hercules Langford Rowley PC (c. 1714 – 25 March 1794) was an Irish politician and landowner.
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Early life
Rowley was born c. 1714. He was the only son of Frances (née Upton) Rowley and Hercules Rowley, a Member of Parliament for County Londonderry from 1703 until his death in 1742. His sister, Dorothy Beresford Rowley, was the wife of Richard Wingfield, 1st Viscount Powerscourt (parents of Edward and Richard, the 2nd and 3rd Viscounts Powerscourt).
His father was the only son of Sir John Rowley (who was knighted for his services at the time of the Restoration) and the former Mary Langford (eldest daughter and heiress of Sir Hercules Langford, 1st Baronet). In 1661, his great-grandfather Langford bought Lynch's Castle (located on the Sumerhill demesne in County Meath) and many other townlands from The Rt Rev. Dr. Henry Jones, the Lord Bishop of Meath. His aunt, Lettice Rowley, was the wife of Arthur Loftus, 3rd Viscount Loftus. His maternal grandfather was Arthur Upton of Castle Upton in County Antrium.
Through his aunt Anne, he was a first cousin of Sir Randal Beresford, 2nd Baronet and through his aunt Mary, he was a first cousin of Mary Clotworthy (who married the Hon. Robert Fitzgerald, a son of George FitzGerald, 16th Earl of Kildare, and was the mother of Robert FitzGerald, 19th Earl of Kildare and grandmother of Lt.-Gen. James FitzGerald, 1st Duke of Leinster).