Why are there so many Vikings slots?

It is sometimes said that this is because so many major production studios come from Scandinavia (or were founded by Scandinavians). This will no doubt allow the theme to be brought to the table faster with developers, but apart from that: Vikings stir something in almost everyone. The rich culture, lore and imaginative famous and infamous Vikings – both men and women – are a grateful and inexhaustible source of inspiration!