Background
He was the son of John Bartlett Allen (1733–1792) a local landowner and colliery owner and his first wife Elizabeth Hensleigh.
He was the son of John Bartlett Allen (1733–1792) a local landowner and colliery owner and his first wife Elizabeth Hensleigh.
Trinity College; Westminster School.
He had 9 sisters, and his brothers-in-law included Josiah Wedgwood II, Sir James Mackintosh (both Whig MPs), John Wedgwood the horticulturist and Jean Charles Léonard de Sismondi the historian. He was High Sheriff of Pembrokeshire in 1809. They had five children:
Gertrude Elizabeth Allen (died 1824)
Seymour Phillips Allen (1814–1861)
Henry George Allen (1815–1908)
John Hensleigh Allen (1818–1868)
Isabel Georgina Allen (1820–1914), married George Lort Phillips.
6th United Kingdom Parliament. 7th United Kingdom Parliament.