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In page House of Babenberg:
"Meanwhile, Rudolf's brother Gebhard was appointed Duke of Lotharingia in 903,[2] and had to cope both with revolting nobles and the continuing attacks by Babenberg forces.[citation needed] Both sides met in the battle of Fritzlar on 27 February 906, where the Conradines won a decisive victory, although Conrad the Elder fell in the battle.[3] Two of the Babenberg brothers were also killed. The third, Adalbert, was summoned before the imperial court by the regent Archbishop Hatto I of Mainz, a partisan of the Conradines. He refused to appear, held his own for a time in his castle at Theres against the king's forces, but surrendered in 906, and in spite of a promise of safe-conduct by Hatto was beheaded.[1]