 Complete the following phrase:  After 1806 Gustav Kirchenpauers father faced ruin on account of the Napoleonic trade restrictions known as the Continental System, the city having fallen under French control earlier . The family therefore left Hamburg in 1810, moving to Saint Petersburg in 1810. Unfortunately the boys mother died the same year: two of his brothers had also died in infancy. Kirchenpauer and his two remaining brothers were sent to live with Jacob von Krause who was married to their fathers sister, Julia and thereby, by marriage, the Kirchenpauer boys uncle. The extended family fled to London during the Autumn of 1812 to avoid the 