inheritance, in opposition to the emperor himself, who had the better
claim. He not only claimed it, but attempted to seize it. With him were
united two Swabian counts of ancient descent, Rudolf Welf, or Guelph,
and Werner of Kyburg.

Swabia was in a blaze when Conrad returned. He convoked a great diet at
Ulm, as the legal means of settling the dispute. Thither Ernst came, at
the head of his Swabian men-at-arms, and still full of rebellious
spirit, although his mother, Gisela, the empress, begged him to submit
and to return to his allegiance.

The angry rebel, however, soon learned that his followers were not
willing to take up arms against the emperor. They declared that their
oath of allegiance to their duke did not release them from their higher
obligations to the emperor and the state, that if their lord was at feud
with the empire it was their duty to aid the latter, and that if their
chiefs wished to quarrel with the state, they must fight for themselves.

This defection left the rebels powerless. Duke Ernst was arrested and
imprisoned on a charge of high treason. Eudolf was exiled. Werner, who
took refuge in his castle, was besieged there by the imperial troops,
against whom he valiantly defended himself for several months. At
length, however, finding that his stronghold was no longer tenable, he
contrived to make his escape, leaving the nest to the imperialists empty
of its bird.

Three years Ernst remained in prison. Then Conrad restored him to
liberty, perhaps moved by the appeals of his mother Gisela, and promised
to restore him to his dukedom of Swabia if he would betray the secret of
the retreat of Werner, who was still at large despite all efforts to