Mary Cassandra Twisleton (1774-1843) (1774–1843) Parents Thomas Twisleton, 13th Baron Saye and Sele Elizabeth Turner Children Maria Jarvis William Jervis Jervis Siblings Julia Twisleton Gregory William Eardley-Twisleton-Fiennes, 8th Baron Saye and Sele Thomas James Twisleton Partners Richard Charles Head Graves Edward Jervis Jervis, 2nd Viscount St Vincent