Helsingør Castle, also known as Kronborg Castle, was the former springtime residence of the Danish royal family and well known for its notable hauntings, and for the terrible events that happened at the castle in 1940. It was built by King Eric VII of Pomerania in the 1420s as a fortress, and only became a castle in the 1580s under King Frederick II of Denmark. A fire destroyed the castle in 1629, was besieged and captured by the Swedes in 1658, became a prison in 1739, and was owned by the Army until 1922, when it became a royal castle again.
King Henrik I of Denmark and Iceland, who ruled from 1928-1939. He ascended to the throne after his father, Klaus, died at 81 of a stroke during a visit to Oslo in 1928. He died at the age of 56 in 1939 due to a snakebite at Helsingør Castle. There is lengthy discussion on whether his death was either a snakebite or cyanide poisoning at the hands of his brother, who was then Prince Claude, which has only been fueled by the fact that an exhumation in 1990 was inconclusive. His ghost is rumored to have been seen at Helsingør Castle, and a sighting is what apparently started the violent murders that happened at the castle in 1940.
King Claude of Denmark and Iceland ruled from 1939-1940. He is rumored to have killed his brother, Henrik I, married his wife, Queen Consort Gertrude, and usurped the throne. He is well known for his actions towards his nephew, Prince Henrik, after he and one of his friends allegedly spread rumors that Claude had killed his brother a year after his death. These included, according to documents declassified in 1996, was deporting Henrik and sending him under an alias to Germany, and ultimately staging a fencing match between the two, which was what lead to Claude's downfall. His methods also led to the death of his wife, Gertrude, when she accidentally drank from a poisoned wine glass at said match.
King Henrik II was Henrik I's son and heir, who reigned for a period of approximately 15 minutes on April 9, 1940, the shortest serving ruler in world history, before dying from both stab wounds during a fencing match with Thorsten Fredrikssen and cyanide poisoning from drinking from a glass poisoned with wine during said duel (it is unknown which killed him first) at age of 28. He is also a mass murderer, responsible for the shooting and/or poisoning deaths of at least 3-5 people in the span of a week in April of 1940.
His murders were apparently done out of revenge for the death of his father, despite the fact that his father was presumably killed via a snakebite (there is conflicting evidence, as explained above). He also claimed, according to one of his friends at Oxford, that the ghost of his father told him to commit the murders as well. They were in order of death,
Peder Fredriksson, an Icelandic-Danish national, a close friend of King Claude, father of Henrik's fiancée and one of his advisers. He was born in Reykjavik in 1868 to a family of Danish nobles who already had close ties with the royal family. He moved to Denmark in 1892 and became close friends with King Klaus, and worked with his descendants and ultimately became an adviser to the King under the reign of King Henrik I.
He was shot and killed by Prince Henrik on April 2, 1940, in a case of mistaken identity. Peder, with the aid of King Claude, was spying on Prince Henrik when he had a conversation with his mother, Queen Consort Gertrude. After Henrik brandished a gun in front of Gertrude, Peter tried to call for help, and in a panicked response, he opened fire on Peder, killing him. He was 72.
This caused many shockwaves among the royal family, first of all his murder was swept under the rug, and only the true cause of death was released to the public 5 years later. Before then, his cause of death was listed as a heart attack. Questions of Henrik's sanity were on everyone's lips, and the death caused the depression and eventual suicide of his daughter and Henrik's fiancee, Ofelia via drowning, and a feud between the Danish royal family and the Fredrikssons to develop.
And finally, Thorsten Fredriksson was the son of Peter, and brother to Henrik's fiancée. He was born in 1915 to only medium fanfare. As he grew up, he tried to stay away from the spotlight as much as possible, and normally traveled to foreign countries, especially visiting Paris, where he was in 1939 and 1940 during the events described above. He only stayed in Denmark during the coronation of King Claude, and after the death of his father and suicide of his sister.
This led to a conflict and rivalry between Henrik and Thorsten over the coming days, culminating in a fencing match arranged by King Claude. Whilst they were promised that they would use regular fencing swords, Claude gave Thorsten a regular sword instead. During the match, Thorsten mortally wounded Henrik, but not before being mortally wounded by Henrik. Thorsten died first. He was 25.
Robert and George Grant were 2 brothers who were also close friends of Prince Henrik from his studying days at Oxford University. Both were born to oil tycoon Thomas Grant in 1913 and 1914, respectively, in their mansion in Devon. They both enjoyed the splendor of aristocracy, before being sent to Oxford in 1932 where they met and became friends with Prince Henrik. The 3 maintained correspondence in the times they were away, before being invited by King Claude to Helsingør in 1940 for the purposes of spying on Prince Henrik.
They failed at their job, as Prince Henrik found out about the plot. Shortly thereafter, the two left for Germany. They disappeared shortly thereafter and was declared dead in 1947 after records showed up of the two's deaths. They were 27 and 26. (It should be noted that whether Henrik was involved or not was disputed)
Commander Franz Edelstein was a German military leader, responsible for commanding the 120th Infantry Division during the Nazi invasion of Denmark in April of 1940. His division was responsible for the invasion and capture of Helsingør Castle and was one of the first witnesses to the bloodbath that had happened approximately an hour prior to his arrival. One of his main motivations behind commanding troops, especially in Denmark, was because of the fact that his grandfather was among the dead in the Second Schleswig War in 1864. Very little is known about his life before World War II, except for the fact that he was born to extremely poor parents in the heart of Hamburg.