OOC: Your leader is Emperor Harald II of the house of Holstein-Gottorp, who is the cousin of the King of Vinland, Ingvar. The
House of Bernadotte, which ruled OTL Sweden at this time, never arose due to Scandinavia never losing Finland and the lack of a certain Corsican Corporal in this timeline.
For a bit of Royal History, Harald I reigned until 1852, and as he had no sons was succeeded by his daughter Kristina II. Late in Kristina's reign in 1892, Vinland's domestic autonomy, which had grown throughout her reign, advanced to full independence. Preferring to establish a native monarchy (and perhaps wanting to avoid having a senile head of state), a cadet branch of the Scandinavian Royal Family was established as the Royal House of Vinland, adopting the name 'Gyllensvärd'. Thus did Ingvar I Gyllensvärd (the firstborn son of Kristina's younger sister, whose name I unfortunately do not know, or possibly hasn't been written in the NES yet) become the first Monarch to reign from Nya Stockholm.
Meanwhile, Kristina II passed away some time between 1892 and 1900, whereupon she was succeeded by Harald II, Ingvar's cousin. Harald reigned in Stockholm until the Proletarist Revolution, and which point he and his government fled to the Scandinavian Kongo. Ingvar remains a close friend of Harald, and you can read some of their written correspondence
here. Both of them were born in the Scandinavian capital, and have been close friends throughout their lives. Harald may be a decade or so older, but I am not certain of his exact birthdate.
Lord of Elves, if you could provide some timelines of Scandinavian Royal History, that would be great. Otherwise, I'll ask for permission to make something up and have you check it over to make sure it contradicts nothing in the canon of updates predating 1900.
At any rate, I'm confident in writing about my own royal family. Our general timeline goes as such:
Ingvar (born 1869) married Lilian (born 1877) in 1896. Their children are Margareta (born 1896), Hendrika (born 1898) and Markus (born 1902). Markus is the Crown Prince of Vinland and heir apparent to the throne, but at age 47 Ingvar's likely still got a few decades left in him.