Question: What King of Prussia was known to make a study of the Seize Quartiers of his courtiers?

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Prince Paata of Kartli: Paata (Georgian: პაატა ; 1720 – December 1765) was a Georgian prince royal ("batonishvili") of the Bagratid House of Mukhrani of Kartli.  A natural son of King Vakhtang VI of Kartli, Paata was brought up and educated as an artillery specialist in the Russian Empire.  His adventurous life led him, through Prussia, Poland, and the Ottoman Empire, to his native Kartli, where he was in service of King Heraclius II, a son of his half-sister, until he led a plot to kill Heraclius and seize the throne for himself in 1765.  After the conspiracy was discovered, Paata was tried, sentenced to death through decapitation on 5 December 1765 and soon executed.

Frederick III, German Emperor: Frederick III (German: "Friedrich" ; 18 October 1831 – 15 June 1888) was German Emperor and King of Prussia for ninety-nine days in 1888, the Year of the Three Emperors.  Friedrich Wilhelm Nikolaus Karl, known informally as "Fritz", was the only son of Emperor Wilhelm I and was raised in his family's tradition of military service.  Although celebrated as a young man for his leadership and successes during the Second Schleswig, Austro-Prussian and Franco-Prussian wars, he nevertheless professed a hatred of warfare and was praised by friends and enemies alike for his humane conduct.  Following the unification of Germany in 1871 his father, then King of Prussia, became the German Emperor.  Upon Wilhelm's death at the age of ninety on 9 March 1888, the thrones passed to Frederick, who had by then been German Crown Prince for seventeen years and Crown Prince of Prussia for twenty-seven years.  Frederick was suffering from cancer of the larynx when he died on 15 June 1888, aged fifty-six, following unsuccessful medical treatments for his condition.

Flag of Prussia: The state of Prussia had its origins in the separate lands of the Margraviate of Brandenburg and of the Duchy of Prussia.  The Margraviate of Brandenburg developed from the medieval Northern March of the Holy Roman Empire, passing to the House of Hohenzollern in 1415.  The Duchy of Prussia originated in 1525 when Albert of Brandenburg-Ansbach, a member of a cadet branch of the Hohenzollerns, secularized the eastern lands of the Teutonic Knights as a Polish fief.  Prince-elector John Sigismund, Elector of Brandenburg, inherited the Duchy of Prussia in 1618, thus uniting Brandenburg and Prussia under one ruler in a personal union; the Elector's state became known as Brandenburg-Prussia.  The Kingdom of Prussia formed when Elector Frederick III assumed the title of Frederick I, King in Prussia, on 18 January 1701.

Cnut the Great: Cnut the Great (Old Norse: "Knútr inn ríki"; c. 995 – 12 November 1035), also known as Canute - whose father was Sweyn Forkbeard (which gave him the patronym "Sweynsson", Old Norse: "Sveinsson") - was King of Denmark, England and Norway; together often referred to as the North Sea Empire.  With the deaths of his heirs within a decade of his own, and Norman conquest of England in 1066, this legacy was mostly forgotten.  He is popularly invoked in the context of the legend of "King Canute and the waves", which usually misrepresents him as a deluded monarch believing he has supernatural powers, contrary to the original legend which portrays a wise king who rebuked his courtiers for their fawning behaviour.

Camarilla: A camarilla is a group of courtiers or favourites who surround a king or ruler.  Usually, they do not hold any office or have any official authority at the royal court but influence their ruler behind the scenes.  Consequently, they also escape having to bear responsibility for the effects of their advice.  The term derives from the Spanish word, "camarilla" (diminutive of "cámara"), meaning "little chamber" or private cabinet of the king.  It was first used of the circle of cronies around Spanish King Ferdinand VII (reigned 1814-1833).  The term involves what is known as cronyism.  The term also entered other languages like the German and Greek language, and is used in the sense given above.

List of monarchs of Prussia: 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.

Seize Quartiers: Seize Quartiers is a French phrase which literally means a person's "sixteen quarters", the coats of arms of their sixteen great-great-grandparents, which are typically accompanied by a five generation genealogy outlining the relationship between them and their descendant.  They were used as a proof of nobility ("the proof of the Seize Quartiers") in Continental Europe beginning in the seventeenth century and achieving their highest prominence in the eighteenth.  Possession of seize-quartiers guaranteed admission to any court in Europe, and bestowed many advantages.  For example, Frederick the Great was known to make a study of the Seize Quartiers of his courtiers.  They were less common in the British Isles, seventeenth-century Scottish examples being the most prevalent.

Senewosret-Ankh (vizier): Senewosret-Ankh was an Ancient Egyptian vizier of the Middle Kingdom, dating to the end of the Twelfth or to the beginning of the Thirteenth Dynasty, around 1800 BC.  He is known from a number of sources making it possible to reconstruct his career.  He started as 'personal scribe of the king's document and was appointed from there to the "overseer of fields".  From this position he was most likely appointed to the position of the vizier.  As vizier he is known from a statue found at Ugarit.  The statue shows him and his wife Henutsen as well as his daughter Zatamun.  The statue also mentioned that to him was given the "gold of praise in front of all courtiers".  It remains unknown for what reason he received that honour.  A stela now in Florence is dedicated to Senewosret-Ankh by "his steward Keki", one of the administrators of Senewosret-Ankh's estates.

Frederick the Great: Frederick II (German: "Friedrich" ; 24 January 171217 August 1786) was King of Prussia from 1740 until 1786, the longest reign of any Hohenzollern king.  His most significant accomplishments during his reign included his military victories, his reorganization of Prussian armies, his patronage of the arts and the Enlightenment in Prussia, and his final success against great odds in the Seven Years' War.  Frederick was the last titled King in Prussia and declared himself King of Prussia after achieving full sovereignty for all historical Prussian lands.  Prussia had greatly increased its territories and became a leading military power in Europe under his rule.  He became known as Frederick the Great ("Friedrich der Große ") and was affectionately nicknamed "Der Alte Fritz " ("Old Fritz") by the Prussian and later by all German people.

Treaties of Reichenbach (1813): The Treaties of Reichenbach were a series of agreements signed in Reichenbach (present-day Dzierżoniów) between Great Britain, Prussia, Russia, and Austria.  These accords served to establish and strengthen a united coalition force against Napoleon I of France.  On 14 June 1813 the Treaty of Reichenbach was signed between Great Britain and Prussia.  Based on the terms of the accord, Britain agreed to provide Prussia a subsidy of 666,666 pounds sterling in order for Prussia to maintain its force of 80,000 troops.  In exchange for this aid, the king of Prussia agreed to cede the principality of Hildesheim and other territories to the Electorate of Hanover.  On 15 June 1813 the Treaty of Reichenbach was signed between Great Britain and Russia.  Based on the terms of the accord, Great Britain agreed to provide Russia with a subsidy of 1,333,334 pounds sterling in order for Russia to maintain its force of 160,000 troops.  On 27 June 1813 the Treaty of Reichenbach (also known as the "Reichenbach Convention") was signed between Prussia, Russia, and Austria.  Based on the terms of the accord, Austria agreed to declare war against Napoleon if he rejected its conditions of peace.

Supporting paragraphs: Seize Quartiers Frederick the Great
Answer: Frederick the Great