This creation (the genre of which the author defines as historical necrorealism) has no direct connection with “Nabla Square,” although, most likely, it describes events in the same universe, but at an earlier time. Despite a bunch of references to real events and characters, “Gorm, son of Hurdaknut” is not a history (real or alternative) of our world. The action takes place on the planet Heim, which is significantly smaller than Earth, has a different chemical composition and orbits the star Sunna of spectral class K. The heroes speak languages similar to Old Norse, Old Slavic, and so on, because their tribes have some functional similarity with the corresponding earthly peoples . Also, for the sake of plausibility, many geographical names, details of crafts, etc. are borrowed.