A recounting "of the Northmen as determined by archeologists" and a study of the world of the Norse gods and the Viking leaders: Exic Bloodax, Leif the Lucky, Olef the Stour, and Harold Handraada.

This book introduces Vikings, who were warriors that left their homes in Norway, Sweden, and Denmark to attack towns and villages all over Europe, from 800 to 1100 A.D.

In order to save the other clans, angry Viking Stieg Engstrom join forces with Erin Amsel, a pain-in-the-neck Crow, but the two must resist each other's charms in order to complete the mission.

"The Doomsday of Yule has arrived, and the future of dragonkind lies in the hands of one boy with nothing to show, but everything to fight for. Hiccup's quest is clear... But can he end the rebellion? Can he prove himself to be king? Can he save the dragons? The stakes have never been higher, as the very fate of the Viking world hangs in the balance!" --

Hiccup, stranded with Toothless on the Beach of the Broken Heart and being hunted by an old enemy, faces Ug the Uglithug, Berserks, and Scarers and tries to save Fishlegs from the Beast.

In the middle years of the ninth century, the fierce Danes sotrmed onto British soil, hungry for spoils and conquest. Kingdom after kingdom fell to the ruthless invaders until but one realm remained. And suddenly the fate of all England--and the course of history--depended upon one man, one king.

Hiccup Horrendous Haddock III, the reluctant Viking hero, tries to make the most of his somewhat limited time to discover America, return to Berk, save his father, fight Polarserpents, and win a swimming race.

"On the shores of the sparsely populated American wilderness, a small group of intrepid settlers have landed, seeking freedom to worship and prosper far from the religious strife and political upheaval that plague a war-ridden Europe... 500 years before Columbus set sail. While it has long been known that Viking ships explored the American coast, recent archaeological evidence suggests a far more vast and permanent settlement. It is from this evidence...

A small but fierce Viking girl, along with her wolverine sidekick, is determined to become a warrior, just like her hero Ingrid the Axe.

Their magic tree house takes Jack and Annie back to a monastery in medieval Ireland, where they try to retrieve a lost book while being menaced by Viking raiders.