The King's succession challenge drives Septimus's quest.
The dying King declares that the first son to recover the ruby will become his successor, and Septimus is one of his princes.
The King places Primus within the royal succession contest.
Primus is identified as one of the King's sons competing to recover the ruby and inherit Stormhold.
Una's royal birth makes her part of the King's family.
Una is revealed to be Septimus's long-lost sister, while Septimus is one of the King's sons.
Explore the full interactive character relationship map of Stardust