question: In which country did both Bruno of Würzburg and Conrad II, Holy Roman Emperor serve in?
answer: Italy
context: Title: Treaty of Merseburg
  Passage: The Treaty of Merseburg of 1033 was an agreement between the Salian Holy Roman Emperor Conrad II and the Piast king of Poland Mieszko II, settling the question of Polish succession which had been contested between Mieszko and his half-brothers Bezprym, Otto, and Dietric, since the death of Bolesław I Chrobry.  Poland was divided into three parts with Mieszko designated as the supreme ruler.  In exchange for the Emperor's support however, Mieszko was forced to renounce the title of king, which had been acquired in 1025 by his father and give up control over Lusatia and Upper Lusatia.  Soon after the treaty was concluded however, Otto died of natural causes and Mieszko prevented Dietric from assuming power in his portion of the divided Poland.  Mieszko also subsequently continued to use the title of king until his death shortly after the treaty in 1034.
  Title: List of Holy Roman Empresses
  Passage: Holy Roman Empress or Empress of the Holy Roman Empire is the title given to the consort (wife) or regent of the Holy Roman Emperor.  The elective dignity of Holy Roman Emperor was restricted to males only, therefore there was never a Holy Roman Empress regnant, though women such as Theophanu or Maria Theresa of Austria, who controlled the power of rule, served as de facto Empresses regnant.
  Title: Conrad II, Holy Roman Emperor
  Passage: Conrad II (c. 990 4 June 1039), also known as Conrad the Elder and Conrad the Salic , was Emperor of the Holy Roman Empire from 1027 until his death in 1039.  The founder of the Salian dynasty of emperors, Conrad also served as King of Germany from 1024, King of Italy from 1026, and King of Burgundy from 1033.
  Title: Bruno (bishop of Würzburg)
  Passage: Bruno of Würzburg (c. 1005 – 27 May 1045), also known as Bruno of Carinthia, was imperial chancellor of Italy from 1027 to 1034 for Conrad II, Holy Roman Emperor, to whom he was related, and from 1034 until his death prince-bishop of Würzburg.
  Title: List of monarchs of Prussia
  Passage: The monarchs of Prussia were members of the House of Hohenzollern who were the hereditary rulers of the former German state of Prussia from its founding in 1525 as the Duchy of Prussia.  The Duchy had evolved out of the Teutonic Order, a Roman Catholic crusader state and theocracy located along the eastern coast of the Baltic Sea.  The Teutonic Knights were under the leadership of a Grand Master, the last of whom, Albert, converted to Protestantism and secularized the lands, which then became the Duchy of Prussia.  The Duchy was initially a vassal of the Kingdom of Poland, as a result of the terms of the Prussian Homage whereby Albert was granted the Duchy as part of the terms of peace following the Prussian War.  When the main line of Prussian Hohenzollerns died out in 1618, the Duchy passed to a different branch of the family, who also reigned as Electors of Brandenburg in the Holy Roman Empire.  While still nominally two different territories, Prussia under the suzerainty of Poland and Brandenburg under the suzerainty of the Holy Roman Empire, the two states are known together historiographically as Brandenburg-Prussia.  Following the Second Northern War, a series of treaties freed the Duchy of Prussia from any vassalage to any other state, making it a fully sovereign Duchy in its own right.  This complex situation (where the Hohenzollern ruler of the independent Duchy of Prussia was also a subject of the Holy Roman Emperor as Elector of Brandenburg) laid the eventual groundwork for the establishment of the Kingdom of Prussia in 1701.  For diplomatic reasons, the rulers of the state were known as the King in Prussia from 1701 to 1772; largely because they still owed fealty to the Emperor as Electors of Brandenburg, the "King in Prussia" title (as opposed to "King of Prussia") avoided offending the Emperor.  As the Prussian state grew through several wars and diplomatic moves throughout the 18th century, it became apparent that Prussia had become a Great Power that did not need to submit meekly to the Holy Roman Empire.  By 1772, the pretense was dropped, and the style "King of Prussia" was adopted.  Thus it remained until 1871, when in the aftermath of the Franco-Prussian War, the King of Prussia Wilhelm I was crowned German Emperor.  From that point forward, though the Kingdom of Prussia retained its status as a constituent state of the German Empire, all remaining Kings of Prussia also served as German Emperor, and that title took precedence.
  Title: Concordat of Worms
  Passage: The Concordat of Worms (Latin: "Concordatum Wormatiense" ), sometimes called the Pactum Calixtinum by papal historians, was an agreement between Pope Calixtus II and Holy Roman Emperor Henry V on September 23, 1122, near the city of Worms.  It brought to an end the first phase of the power struggle between the Papacy and the Holy Roman Emperors and has been interpreted as containing within itself the germ of nation-based sovereignty that would one day be confirmed in the Treaty of Westphalia (1648).  In part this was an unforeseen result of strategic maneuvering between the Church and the European sovereigns over political control within their domains.  The King was recognised as having the right to invest bishops with secular authority ("by the lance") in the territories they governed, but not with sacred authority ("by ring and staff").  The result was that bishops owed allegiance in worldly matters both to the pope and to the king, for they were obliged to affirm the right of the sovereign to call upon them for military support, under his oath of fealty.  Previous Holy Roman Emperors had thought it their right, granted by God, to name Church officials within their territories (such as bishops) and to confirm the Papal election (and, at times of extraordinary urgency, actually name popes).  In fact, the Emperors had been heavily relying on bishops for their secular administration, as they were not hereditary or quasi-hereditary nobility with family interests.  A more immediate result of the Investiture struggle identified a proprietary right that adhered to sovereign territory, recognising the right of kings to income from the territory of a vacant diocese and a basis for justifiable taxation.  These rights lay outside feudalism, which defined authority in a hierarchy of personal relations, with only a loose relation to territory.  The pope emerged as a figure above and out of the direct control of the Holy Roman Emperor.
citations: Conrad II, Holy Roman Emperor Bruno (bishop of Würzburg)