Ketevan gives birth to their son Yakov Dzhugashvili the following year. After the Tiflis bank robbery Joseph and his family escape Tsarist forces by travelling to Baku in Azerbaijan. When Ketevan dies of typhus in 1907, Joseph is wracked with grief. He leaves his son to be cared for by his wife’s parents and throws himself into his revolutionary work. He adopts the name 'Stalin' which means 'steel' in Russian. He is arrested on a number of occasions and exiled to Siberia in 1910.