Scandinavian Royalty and Attempts on Behalf of Judah by Orjan Svenssun
Next year it will be 80 years anniversary of the rescue of the Danish Jews from Denmark to Sweden.
Some points concerning Gustaf V, king of Sweden between 1907 and 1950, see https://en.wikipedia.org/wiki/Gustaf_V:
"On a visit to Berlin, Gustaf went straight from a meeting with Hitler to a tennis match with the Jewish player Daniel Prenn."
"Both the King and his grandson Prince Gustav Adolf socialized with Nazi leaders before World War II, though arguably for diplomatic purposes. Gustaf V attempted to convince Hitler during a visit to Berlin to soften his persecution of the Jews, according to historian Jorgen Weibull. He was also noted for appealing to the leader of Hungary to save its Jews "in the name of humanity.""
See also https://en.wikipedia.org/wiki/Daniel_Prenn:
"When the Nazis came to power in Germany in 1933, they barred him from playing because he was Jewish."
"The Swedish king, Gustaf V, a keen tennis player, dined with the German top brass in the summer of 1933, criticizing the new racial policies. After the lunch, the elderly king played a game with Prenn. Shortly thereafter, Prenn moved to Great Britain."
One point of interest is also that one of the biggest squares in Copenhagen, capital of Denmark, is called Israels plads, meaning Israel Square.
"Gronttorvet was renamed Israels Plads on 11 October 1968, the 25th anniversary of Nazi persecution of Jews in Denmark."
On the Israel square in Copenhagen is a big stone with inscription "And it became evening and it became morning" in Hebrew (from Genesis).