 Subsequently, in 1878, he married Emily Stoehr who added a further four sons and three daughters, their eldest son, Ernest Darwin, was to succeed him on his death as head of the business and become Baron Simon of Wythenshawe in 1947.Despite arriving in Manchester in 1860 without a penny to his name, within seven years Henry had established himself as a consulting engineer with his own office and become a naturalised British Citizen.But it was in 1878 when he saw his first real success.