Ælfric Cild ("fl".
 975-985) was a wealthy Anglo-Saxon nobleman from the east Midlands, ealdorman of Mercia between 983 and 985, and possibly brother-in-law to his predecessor Ælfhere.
 He was also associated with the monastic reformer Æthelwold, bishop of Winchester, he is also notable for being involved in a number of land transactions for the refounding and endowment of Peterborough Abbey, as well as with Thorney Abbey during the 970s and early 980s.
Burgrave (from German: "Burggraf" , Latin: "burggravius, burcgravius, burgicomes" ) was since the medieval period a title for the ruler of a castle, especially a royal or episcopal castle, as well as a castle district (castellany) or fortified settlement or city.
 The burgrave was a "count" in rank (German "Graf", Latin "Comes") equipped with judicial powers.
 The title became hereditary in certain feudal families and was associated with a territory or domain called a "Burgraviate" (German "Burggrafschaft", Latin "Prefectura").
 The position and office of burgrave could be held either by the king, a nobleman or a bishop, the responsibilities were administrative, military and jurisdictional.
Friedrich II.
 Graf von Hahn (July 27, 1742 – October 9, 1805) was a German nobleman, a philosopher and astronomer.
 He suggested the Doppler effect before Doppler.
Tycho Brahe ( , born Tyge Ottesen Brahe (] ); 14 December 154624 October 1601) was a Danish nobleman known for his accurate and comprehensive astronomical and planetary observations.
 He was born in the then Danish peninsula of Scania.
 Well known in his lifetime as an astronomer, astrologer and alchemist, he has been described as "the first competent mind in modern astronomy to feel ardently the passion for exact empirical facts."
 His observations were some five times more accurate than the best available observations at the time.
Duncan Campbell was a Scots nobleman who died on 18 July 1758 as a result of wounds received in an unsuccessful frontal attack against French forces at Fort Carillon (renamed Fort Ticonderoga when the British took the fort a year later).
 The legend associated with Campbell is that a number of years prior—while still living in Scotland—Campbell gave shelter to a stranger who turned out to have killed Duncan's cousin.
 Faced with the conflict between betraying a guest or taking vengeance for the death of his cousin, Campbell compromised by allowing the killer to hide out in a cave.
 The ghost of Campbell's cousin is claimed to have appeared to Campbell in a dream and promised to meet him again at "Ticonderoga", a place that Duncan surely had never heard of previously.
 This story was published in the poem "Ticonderoga a Legend of the West Highlands" by Robert Louis Stevenson in "Scribner's Magazine" December 1887.
Uraniborg (Danish: "Uranienborg" , Swedish: "Uraniborg" ) was a Danish astronomical observatory and alchemical laboratory established and operated by Tycho Brahe.
 It was built  1576 – c. 1580 on Hven, an island in the Øresund between Zealand and Scania, which at that time was part of Denmark.
 Shortly after its construction, the observatory was expanded with an underground facility, Stjerneborg, on an adjacent site.
A chamberlain (Medieval Latin: "cambellanus" or "cambrerius", with charge of treasury "camerarius") is a senior royal official in charge of managing a royal household.
 Historically, the chamberlain superintends the arrangement of domestic affairs and was often also charged with receiving and paying out money kept in the royal chamber.
 The position was usually honoured upon a high-ranking member of the nobility (nobleman) or the clergy, often a royal favourite.
 Roman emperors appointed this officer under the title of "cubicularius".
 The papal chamberlain of the Pope enjoys very extensive powers, having the revenues of the papal household under his charge.
 As a sign of their dignity, they bore a key, which in the seventeenth century was often silvered, and actually fitted the door-locks of chamber rooms, since the eighteenth century it had turned into a merely symbolic, albeit splendid, rank-insignia of gilded bronze.
 In many countries there are ceremonial posts associated with the household of the sovereign.
Otte Rømer (c. 1330 – 14 August 1409) was a Norwegian nobleman, state councilor, and landowner.
 He is associated with establishing his family ownership of Austrått estate in Ørland, Sør-Trøndelag, Norway.
Otte Brahe (] ; 2 October 1518 – 9 May 1571) was a Danish (Scanian) nobleman and statesman, who served on the privy council (Rigsraad, "Council of the Realm").
 He was married to Beate Clausdatter Bille and was the father of astronomer Tycho Brahe.
Albert Henry George Grey, 4th Earl Grey (28 November 185129 August 1917) was a British nobleman and politician who served as Governor General of Canada, the ninth since Canadian Confederation.
 He was a radical Liberal aristocrat, founder of the Society of Apostles, and Aricles Club and a member of a string of liberal high society clubs in London.
 An active and articulate campaigner in late Victorian England he was associated with many of the leading Imperialists seeking change.

Question: What astronomer and nobleman is associated with Uraniborg?
Answer: Tycho Brahe