Corfitz Ulfeldt

Corfitz Ulfeldt (1606–1664) was Denmark's most notorious traitor. The son of Chancellor Jacob Ulfeldt, he married Christian IV's daughter Leonora Christina in 1636 and became steward of the realm in 1643.

Suspected of embezzlement after Frederick III's accession, he fled to Sweden in 1651, and in the war of 1657–1658 guided Charles X Gustav's army across the frozen Belts and negotiated for Sweden the Treaty of Roskilde. Later condemned by Sweden too, he died a hunted fugitive in 1664; his wife then spent twenty-two years in Copenhagen's Blue Tower.