In Weimar on 26 May 1555 John Frederick II married his first wife, Agnes of Hesse, Dowager Electress of Saxony. Six months later she suffered a miscarriage and died, on 4 November 1555. In Weimar on 12 June 1558 John Frederick II married his second wife, Countess Palatine Elisabeth of Simmern-Sponheim , daughter of the later (1559) Frederick III, Elector Palatine .
Lothair (1174/1175 – 15 October 1190). He remained in Saxony when his parents went in exile to England in 1182 as hostage to Henry VI King of the Romans to guarantee his father's agreement to the terms of his banishment and later as a guarantee of Henry the Lion's performance with the peace terms agreed at Fulda in July 1190.