An emperor of this name fought three wars with his father's former ally, Boleslaw Chrobry, theking of Poland. Welf III of Carinthia led a rebellion against an emperor of this name, whose wifeAgnes joined him in zealous support of the Cluniac movement. That emperor of this name convenedthe Synod of Sutri to elevate Suidger to the Papacy as Clement II. An emperor of this name fled toWorms during a Saxon rebellion and had to tear down Harz Castle to make peace prior to extractingoaths in support of his son (*) Conrad. That emperor of this name's interference in the conflict with thePatarines in Milan led to him receiving a letter comparing him to Saul, before he was challenged by a newmonarchial election at Tribur which forced him to visit Matilda of Tuscany's castle 
An emperor of this name fought three wars with his father's former ally, Boleslaw Chrobry, theking of Poland. Welf III of Carinthia led a rebellion against an emperor of this name, whose wifeAgnes joined him in zealous support of the Cluniac movement. That emperor of this name convenedthe Synod of Sutri to elevate Suidger to the Papacy as Clement II. An emperor of this name fled toWorms during a Saxon rebellion and had to tear down Harz Castle to make peace prior to extractingoaths in support of his son (*) Conrad. That emperor of this name's interference in the conflict with thePatarines in Milan led to him receiving a letter comparing him to Saul, before he was challenged by a newmonarchial election at Tribur which forced him to visit Matilda of Tuscany's castle and meet with GregoryVII. For 10 points, give this name held by the Holy Roman Emperor who knelt in the snow at Canossaduring the lay investiture controversy.
An emperor of this name fought three wars with his father's former ally, Boleslaw Chrobry, theking of Poland.
Henry