1904: Nikolai Valentinov got to know Vladimir Lenin in Geneva, where the Bolshevik leader was living with his wife, Nadezhda Krupskaya. Valentinov’s Encounters with Lenin gives glimpses of Lenin’s domestic life. He liked to walk in the country and enjoyed picnics. He swam well and skated well. He exercised on the trapeze and on rings. He was very good at billiards. Before starting work each morning, he dusted his books and put them in order. He cleaned his shoes until they shone. If he lost a button, he would sew on another himself, and this he did “better than Nadya”.
Source: Nikolay Valentinov, Encounters with Lenin (1968), pp. 79–80