Mechthild of Sponheim-Starkenburg 1312 - 25 Dec 1357 (or 25 Nov 1375) Parents Rudolf I Mechtild of Nassau Mechtild of Nassau Children Mathilde of Sponheim Loretta, Gräfin von Sponheim-Starkenburg Johann IV. Siblings Rupert I, Elector Palatine Adolf, Count Palatine of the Rhine Rudolf II, Count Palatine of the Rhine Partners Johann III, Count of Sponheim-Starkenburg