Herditary Prince Ferdinand and Hereditary Princess Caroline
Child of:Hereditary Prince (arveprins) Frederik of Denmark and Sophie Frederikke of Mecklenburg
Marriage: 1829 to Caroline of Denmark
Heir presumptive from 1848-63. As he died childless*, before his nephew, Frederik VII, the throne went to Christian IX.
*) Childless in marriage. Ferdinand had two daughters with his mistress before he married.