The Ducal Crypt is a burial chamber beneath the chancel of Stephansdom in Vienna, Austria. It holds 78 containers with the bodies, hearts, or viscera of 72 members of the House of Habsburg.
Emperor Matthias is the first emperor whose viscera are deposited here. They were brought to the Ducal Crypt from their original resting place over 20 years later, after the testament of emperor-elect King Ferdinand IV of the Romans had set the precedent for honoring these three churches with the remains of the members of the Imperial Family.
Emperor Leopold I41 enlarged the Imperial Crypt at the Kapuzinerkirche and established the tradition of burying members of the Imperial Family in these three churches in Vienna, following the precedent set in 1654 by King Ferdinand IV of the Romans.
Archduke Franz Karl Joseph of Austria was a member of the House of Habsburg-Lorraine. He was the father of two emperors: Franz Joseph I of Austria and Maximilian I of Mexico. Through his third son Karl Ludwig, he was the grandfather of Archduke Franz Ferdinand of Austria – whose assassination sparked the hostilities that led to the outbreak of World War I – and the great-grandfather of the last Habsburg emperor Karl I.
Franz Karl at age 37, 1839.