"Upon the death of Emperor Henry V in 1125, the Salian dynasty became extinct. Frederick II, Henry's nephew, stood for election as King of the Romans with the support of his younger brother Conrad and several princely houses. However, he lost in the tumultuous round of elections,[citation needed] led by Archbishop Adalbert of Mainz, to the Saxon duke Lothair II. Frederick at first rendered homage to the new king, however, he refused the feudal oath and insisted on the inheritance of the Salian family estates along the Middle Rhine.[5]
At the 1125 Hoftag diet in Regensburg, the king officially requested the surrender of the Salian possessions. After he imposed an Imperial ban on the Hohenstaufens, a conflict erupted between Frederick and his supporters, and Lothair: encouraged by Archbishop Adalbert and several princes, the king occupied Hohenstaufen lands in Upper Lorraine and Alsace. However, an attack by Welf forces on the Swabian core territory failed, like the siege of Nuremberg by Lothair in 1127. Frederick relieved the siege and moreover gained the support from his brother Conrad, who had just returned from a pilgrimage to the Holy Land. During the fighting, Frederick lost an eye"
At the 1125 Hoftag diet in Regensburg, the king officially requested the surrender of the Salian possessions. After he imposed an Imperial ban on the Hohenstaufens, a conflict erupted between Frederick and his supporters, and Lothair: encouraged by Archbishop Adalbert and several princes, the king occupied Hohenstaufen lands in Upper Lorraine and Alsace. However, an attack by Welf forces on the Swabian core territory failed, like the siege of Nuremberg by Lothair in 1127. Frederick relieved the siege and moreover gained the support from his brother Conrad, who had just returned from a pilgrimage to the Holy Land. During the fighting, Frederick lost an eye"
