BÃ 1\/4 yÃ 1\/4 kada , ( in English : Big Island ) is an island in the Sea of Marmara , near Istanbul , Turkey . A convent on BÃ 1\/4 yÃ 1\/4 kada was the place of exile for the Byzantine empresses Irene , Euphrosyne , Theophano , Zoe and Anna Dalassena . After his deportation from the Soviet Union in February 1929 , Leon Trotsky also stayed for four years on BÃ 1\/4 yÃ 1\/4 kada , his first station in exile .