Lev Lvovich Sedov (Russian: Лев Львович Седов, also known as Leon Sedov; 24 February 1906 – 16 February 1938) was the first son of the Soviet communist leader Leon Trotsky and his second wife Natalia Sedova. He was born when his father was in prison facing life imprisonment for having participated in the Revolution of 1905. Source: Wikipedia (en)