Shield of the North is a title of the Kandori and Saldaean monarchs. The title alludes to the fact that both nations are in the north and guard against invasion of Trollocs from the Great Blight. Currently, Queen Ethenielle Kirukon Materasu and Queen Tenobia si Bashere Kazadi holds this title.
The shared nature of this title may originate from the old nation of Basharande which existed during the Free Years. Basharande included most of what is present day Saldaea and part of present day Kandor, most importantly the part containing the capital city of Chachin. The ruler of Kandor also holds the Sword of Kirukan, an artefact from the even earlier nation of Aramaelle, which covered modern day Shienar, Arafel and eastern Kandor, again including the region which now contains Chachin. While the cities of Aramaelle would have been destroyed during the Trolloc Wars, it is a valid theory that the rulers of Basharande at one point became rivals with the eastern ruler retaining authority via the ancient blade, while the western ruler retained most of the land. While the Borderlands going to war seems unlikely, a split of equally valid claims to the title seems possible.