Julli's grave marker reads that he was born on July 11, 1834, and died on April 1, 1848. At this point it had been mentioned that Herald had been on the run for six months, which means this story takes place between November 1847 to April 1848.
In Iceland, the name Nonni is a common nickname for boys named Jon. The name Manni is a common nickname for boys named Armann. This series was based on the book by Jon Sveinsson, who wrote it influenced by his own upbringing. Jon Sveinsson's boyhood name was Nonni, and his younger brother Armann was called Manni, which are the two main characters.