Johann Friedrich Joseph Karl von Sachsen-Altenburg
- Born on January 8, 1841 in Sigmaringen
- Deceased on February 25, 1844, at the age of 3 years
Parents
- Eduard von Sachsen-Altenburg (1804 - 1852), Prinz von Sachsen-Altenburg
- Amalie von Hohenzollern-Sigmaringen (1815 - 1841)