Robert Lucas de Pearsall (1795-1856) was born in Bristol, England, but owing to ill health spent most of his life in Germany and Switzerland. He is best remembered for his superb setting of the Christmas carol "In Dulci Jubilo." This is one of a number of hymns by Pearsall included in the Arundel Hymnal edited by the Fifth Duke of Norfolk and published in 1905. I am most grateful to Mr. Robert Stoltz for bringing this source to my attention.
Robert Lucas de Pearsall (1795-1856), portrait by his daughter Philippa Swinnerton Hughes (née Pearsall). Image courtesy of Wikipedia Commons