After his return to the land of the Geats, Beowulf served Higelac faithfully till the day of the king's death, which befell in an expedition that he made to Friesland. Beowulf was with him on that disastrous journey, and only with difficulty did he escape with his life. But when he returned as a poor solitary fugitive to his people, Hygd, Higelac's wife, offered him the kingdom and the king's treasures, for she feared that her young son Heardred was not strong enough to hold the throne of his fathers against invading foes.
Beowulf, however, would not accept the kingdom, but rather chose to uphold Heardred among the people, giving him friendly counsel and serving him faithfully and honorably.
But before very long Heardred was killed in battle, and then at last Beowulf consented to become king of the Geats.
For fifty years he ruled well and wisely and his people prospered. But at last trouble came in the ravages of a terrible dragon, and once more Beowulf was called forth to a terrific combat.
For three hundred years this dragon had kept watch over a hoard of treasure on a mountain by the seashore in the country of the Geats. The treasure had been hidden in a cave under the mountain by a band of sea-robbers; and when the last of them was dead the dragon took possession of the cave and of the treasure and kept fierce watch over them.
But one day a poor man came to the spot while the dragon was fast asleep and carried off part of the treasure to his master.
When the dragon awoke he soon discovered the man's footprints, and on examining the cave he found that part of the gold and splendid jewels had disappeared. In wrathful and savage mood he sought all round the mountain for the robber, but could find no one.
So when evening came he went forth eager for revenge, and throwing out flashes of fire in every direction, he began to set fire to all the land. Beowulf's own princely manor-house was burnt down and terrible destruction was wrought on every hand, till day broke and the fire-dragon returned to his den.
Great was Beowulf's grief at this dire misfortune, and eager was his desire for vengeance. He scorned to seek the foe with a great host behind him, nor did he dread the combat in any way, for he called to mind his many feats of war, and especially his fight with Grendel.
So he quickly had fashioned a mighty battle-shield, made entirely of iron, for he knew that the wooden one that he was wont to use would be burnt up by the flames of the fire-dragon. Then he chose out eleven of his earls, and together they set out for the mountain, led thither by the man who had stolen the treasure.