 Complete the following phrase:  Kar was married to Princess Maria Sergeyevna Khovanskaya 1756-1833, and together they had four children: Ekaterina, Anna, Aleksey, and Sergei died 1869. After the death of her husband she retired to a monastery in Kaluga. Both of his sons entered the military and fought against Napoleons Invasion in 1812. Aleksey would lose a leg at 