Karen Anderson & Poul Anderson 
Dog and the Wolf [EPUB ebook] 

In the fourth and final book of the King of Ys series, Gratillonius and the Ysan survivors have one final chance to rebuild in the wake of inconceivable destruction As legendary as King Arthur’s Court and as mystical as Atlantis, the fabled kingdom of Ys has finally fallen, the victim of invading hordes and vengeful gods. Destitute, the remaining Ysans put their faith in their longtime leader, Gratillonius, who protected the city-state of Ys for two decades before it succumbed to the malevolent forces surrounding it. Now more vulnerable than ever, Gratillonius and the Ysans set out to rebuild their beloved city, first with wood and then with stone, providing a fortress against the elements and the marauding King Niall maqq Echach, still on his years-long quest to see Ys turned to dust. While the Dark Ages begin to rise across Europe, the Ysans and their king grasp one last time for survival—lest their history be lost forever.  The Dog and the Wolf is the final book in Poul and Karen Anderson’s King of Ys series, which also includes Roma Mater, Gallicenae, and Dahut.