|Count Corfits Ulfeldt|
|Born||10 July 1606|
Hagenskov Castle, Assens, Denmark
|Died||20 February 1664|
|Spouse||Countess Leonora Christina af Slesvig og Holsten|
|Issue||Count Christian Ulfeldt|
Countess Anna Katrine Ulfeldt
Count Jakob Ulfeldt
Countess Ellen Ulfeldt
Count Ludwig Ulfeldt
Count Corfitz Ulfeldt
Count Leo Belgicus Ulfeldt
Countess Leonora Sophie Ulfeldt
Count Otto Ulfeldt
Count Leo Ulfeldt
Count Corfits Ulfeldt (10 July 1606 – 20 February 1664), Danish statesman, was the son of the chancellor Jacob Ulfeldt. After a careful education abroad, concluding with one year under Cesare Cremonini at Padua, he returned to Denmark in 1629 and quickly won the favor of King Christian IV. In 1634 he was made a Knight of the Order of the Elephant, in 1636 became Councillor of State, in 1637 Governor of Copenhagen, and in 1643 Steward of the Realm. He is commonly known and recognized as the most notorious traitor in Danish history. 
Rise to power
In 1637 Ulfeldt married Leonora Christina (1621–1698) who was the daughter of King Christian IV of Denmark. She had been betrothed to him from her ninth year. Ulfeldt was the most striking personality at the Danish court in all superficial accomplishments, but his character was marked by ambition, avarice and absolute lack of honor or conscience. He was largely responsible for the disasters of the Swedish war of 1643-45, and when the Treaty of Brömsebro was signed there was a violent scene between him and the King, though Ulfeldt's resignation was not accepted.
In December 1646 he was sent as ambassador extraordinary to the Hague, but the results of his embassy by no means corresponded to its costliness, and when he returned to Denmark in July 1647 he found the king profoundly irritated. Ulfeldt, supported by the Rigsråd and the nobility, who objected to Christian's fiscal policy, resisted his father-in-law, and triumphed completely. As Steward of the Realm he was the virtual ruler of Denmark during the two months which elapsed between the death of Christian IV and the election of Frederick III (6 July 1648); but the new king was by no means disposed to tolerate the outrageous usurpations of Ulfeldt and his wife, and this antagonism was still further complicated by allegations of a plot (ultimately proved to be false, but believed at the time to be true) on the part of Dina Vinhofvers, a former mistress of Ulfeldt, to poison the royal family. Dina was convicted of perjury and executed, but Ulfeldt no longer felt secure at Copenhagen, and on the day after the execution he secretly left Denmark (14 July 1651) with his family.
After living for a time in concealment at Amsterdam, Ulfeldt moved to Stralsund in Swedish Pomerania. In 1657, King Charles X of Sweden invaded Denmark. in July 1657 Ulfeldt responded to the King's invitation to enter his service. Sweden was Denmark's deadliest foe. Ulfeldt's purpose was twofold: humiliate his monarch and secure a personal fortune. He persuaded the commandant of Nakskov (a strategically crucial fortress) to surrender to Charles X, and did his best to convince his countrymen that resistance was useless. He even loaned the Swedish king a fortune to finance the war with money that, it is believed, was embezzled from the Danish state. Finally, as one of the Swedish negotiators at the Treaty of Taastrup, he was instrumental in assuring the humiliation of his native land.
Ulfeldt's treason was rewarded by Charles X of Sweden with ennoblement as the Count of Sölvesborg in Blekinge; however a discontented Ulfeldt instead began intriguing against his new master. He was soon discovered, and in May 1659 was sentenced to death. On 7 July the Swedish regents amnestied him, and he returned to Copenhagen to try to make his peace with his lawful sovereign, who promptly imprisoned him and his wife. In the summer of 1660 they were conveyed to Hammershus in Bornholm, as prisoners of state.
Their captivity was severe to brutal and they were released in September 1661 in the most degrading conditions. The fallen magnate henceforth dreamed of nothing but revenge, and in the course of 1662, during his residence at Bruges, he offered the Danish crown to the Frederick William I, Elector of Brandenburg, proposing to raise a rebellion in Denmark for that purpose. Frederick William betrayed Ulfeldt's treason to Frederick III, and the Danish government at once impeached the traitor; on 24 July 1663 he and his children were degraded, his property was confiscated, and he was condemned to be beheaded and quartered.
He escaped from the country, but the sentence was actually carried out on his effigy; and a pillory was erected on the ruins of his mansion at Copenhagen. During a new flight he died February 1664 in a boat on the Rhine not far from Basel. The circumstances of his death or his final resting place are not known.
To posterity Corfits Ulfeldt has stood as the prototype of a traitor in Danish history. In addition, modern historians have been liable to view him as a highly mentally unstable man whose lust for power ended in megalomania and insanity.
In contrast his wife Leonora Christina has been admired because of her long time as a prisoner after his death. She spent twenty-one years in confinement in the royal dungeon, Blåtårn, prior to her release during 1685. Jammers Minde is an autobiography completed in 1674 by Leonora Christina. It was first published in 1869 and translated into English as Memoirs of Leonora Christina.  
- Steffen Heiberg. "Corfitz Ulfeldt". Dansk Biografisk Leksikon, Gyldendal. Retrieved December 1, 2018.
- Chisholm 1911.
- "Leonora Christina Ulfeldt (1621–98)". kalliope.org. Retrieved December 1, 2018.
- "Dina Vinhofvers (ca. 1620-1651)". Dansk kvindebiografisk lexicon. Retrieved December 1, 2018.
- "Hammershus Slotskapel". Nationalmuseet. Retrieved December 1, 2018.
- "Corfitz Ulfeldt". Roskilde Historie. Retrieved December 1, 2018.
- Leon Jespersen, Merete Harding. "Jammers Minde". Den Store Danske, Gyldendal. Retrieved December 1, 2018.
- Steffen Heiberg (1993) Enhjørningen Corfitz Ulfeldt (Copenhagen: Gyldendal) ISBN 87-00-54936-3
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). . Encyclopædia Britannica. 27 (11th ed.). Cambridge University Press.
- Leonora Christina Ulfeldt. Memoirs of Leonora Christina: Daughter of Christian IV. of Denmark; Written During Her Imprisonment In the Blue Tower At Copenhagen 1663-1685. Library of Alexandria. ISBN 978-1-4655-1373-1.
- Leonora Christina (2010). Jammers Minde (in Danish). Gyldendal A/S. ISBN 978-87-02-07970-8.