In the early 18th century, Denmark was ruled by absolute monarchs, whose personalities left their marks on the country. When Frederik IV was young, he didn’t say no to anything life had to offer. In old age, he turned to religion, and demanded that the rest of Denmark do the same.

Karl XII had failed to get the Ottomans to ally with Sweden in the Great Northern War, but that didn’t mean he was willing to throw in the towel. As soon as he returned home, he decided to go back to fighting. This time, he had his sights on Sweden’s traditional enemy–Denmark.

After the disaster at Poltava, the Swedish empire started to unravel. But instead of hurrying home to try and save what he could, Karl XII spent years in the Ottoman Empire. He wasn’t enjoying an extended vacation in southern climes, though. He was trying to convince the sultan to attack Russia, thereby easing the pressure on Sweden.

After defeating Denmark and Poland, Karl XII only needed to crush the Russians in order to declare victory in the Great Northern War. So as soon as he was done with his side quest in Saxony, he marched on Moscow to face the Final Boss, Peter the Great.

In the year 1700, Sweden was ruled by an autocratic teenager with impulse control issues. That could have been bad enough, but then Denmark, Poland and Russia declared war and attacked simultaneously. Karl XII was going to have to shape up, and fast, if he wanted to remain king of anything at all in the years to come.

After the Scania War, Karl XI realized that Sweden was too weak to defend its northern European empire. To change this, he pushed through three important reforms that radically changed the Swedish army, economy and system of government. But would it be enough? And would the reforms survive the death of the king?

There had been a few witch trials here and there in Scandinavia since the Middle Ages, but it was only after the Reformation that they became a large-scale phenomenon. In the reign of Karl XI, Sweden became the scene for the greatest witch hunt in Scandinavian history.

In the second half of the 17th century, Swedish authorities initiated a campaign to turn the formerly Danish provinces of Blekinge, Halland and Scania Swedish. They used both carrots and sticks to change these new territories politically, economically and culturally. The process wasn’t always smooth.

Christian V may not have been particularly interested in books, administration or the French language. He didn’t care much about governing Denmark, but he was passionate about restoring its old borders. For that reason, he declared war on Sweden in 1675–a few weeks after he promised his sister could marry the Swedish king.

In a few days Christmas will be upon us. To mark the occasion, this episode of the Scandinavian History Podcast is dedicated to quirks of Nordic culture. It’s a totally subjective list of the five weirdest Scandinavian Christmas traditions–from the most normal to the weirdest.