Until this point in his life, Trotsky had used his birth name: Lev (Leon) Bronstein. He changed his surname to "Trotsky"—the name he would use for the rest of his life. It is said he adopted the name of a jailer of the Odessa prison in which he had earlier been held. This became his primary revolutionary pseudonym. After his escape from Siberia, Trotsky moved to London, joining Georgi Plekhanov, Vladimir Lenin, Julius Martov and other editors of "Iskra". Under the pen name "Pero" ("feather" or "pen"), Trotsky soon became one of the paper's leading writers.