Question: Who was the king of England who became king after the death of his younger brother and whose reign was chaotic due to rivalry with relatives until his own death a few decades later?

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Kassapa III was King of Anuradhapura in the 8th century, whose reign lasted from 732 to 738.  He succeeded his brother Aggabodhi V as King of Anuradhapura and was succeeded by his younger brother Mahinda I. Nicholas I (Russian: Николай I Павлович , "Nikolay I Pavlovich" ; 6 July [O.S. 25 June] 1796 – 2 March [O.S. 18 February] 1855 ) was the Emperor of Russia from 1825 until 1855.  He was also the King of Poland and Grand Duke of Finland.  He is best known as a political conservative whose reign was marked by geographical expansion, repression of dissent, economic stagnation, poor administrative policies, a corrupt bureaucracy, and frequent wars that culminated in Russia's defeat in the Crimean War of 1853–56.  His biographer Nicholas V. Riasanovsky says that Nicholas displayed determination, singleness of purpose, and an iron will, along with a powerful sense of duty and a dedication to very hard work.  He saw himself as a soldier—a junior officer totally consumed by spit and polish.  A handsome man, he was highly nervous and aggressive.  Trained as an engineer, he was a stickler for minute detail.  In his public persona, says Riasanovsky, "Nicholas I came to represent autocracy personified: infinitely majestic, determined and powerful, hard as stone, and relentless as fate."  His reign had an ideology called "Official Nationality" that was proclaimed officially in 1833.  It was a reactionary policy based on orthodoxy in religion, autocracy in government, and Russian nationalism.  He was the younger brother of his predecessor, Alexander I.  Nicholas inherited his brother's throne despite the failed Decembrist revolt against him and went on to become the most reactionary of all Russian leaders.  His aggressive foreign policy involved many expensive wars, having a disastrous effect on the empire's finances. The House of Wessex, also known as the House of Cerdic ("Cerdicingas" in Old English), refers to the family that initially ruled a kingdom in southwest England known as Wessex, from the 6th century under Cerdic of Wessex until the unification of the Kingdoms of England by Alfred the Great and his successors (Though Alfred's grandfather Egbert was the one to start consolidating West saxon domination).  Alfred and his successors would also be part of this dynasty, which would continue ruling in the main line all the way until Alfred's descendant, Ethelred the Unready, whose reign in the late 10th century and early 11th century saw a brief period of Danish occupation and following his and his son Edmund Ironside's death, kingship by the Danish Cnut the Great and his successors to 1042.  The House of Wessex then briefly regained its power for 24 years, but after the deposition of its last scion, Ethelred's great-grandson Edgar Atheling would fade into the annals of history after the death of Edgar Atheling in 1125. Phaungkaza Maung Maung (Burmese: ဖောင်းကားစား မောင်မောင် ] ; 15 September 1763 – 11 February 1782) was the fifth king of the Konbaung Dynasty of Burma, whose reign lasted a week.  Maung Maung, the eldest son of Naungdawgyi, the second king of the Konbaung Dynasty, was granted Phaungga in fief.  On 5 February 1782, the 18-year-old Prince of Phaungka seized the throne while his cousin King Singu, was away on tour.  His uncle Prince of Badon (later King Bodawpaya) quickly came to palace and deposed him exactly a week later, 11 February 1782.  Maung Maung and his chief queen were drowned to death on the same day.  He had four queens and no children. Lydia, known as Sparda in Old Persian, was a satrapy of the Achaemenid Empire, with Sardis as its capital.  Tabalus, appointed by Cyrus the Great was the first satrap; however, his rule did not last long as the Lydians revolted.  The insurrection was suppressed by general Mazares and his successor Harpagus.  After Cyrus' death, Oroetus was appointed as satrap.  Oroetus ruled during the reign of Cambyses, and after the chaotic period that followed the Persian king's death, he conquered the Greek isle of Samos, killing its ruler Polycrates.  Due to his growing power, Darius the Great had Bagaeus kill Oroetus.  Bagaeus himself may have become satrap for a short period, but the next rulers were Otanes and Darius' younger brother, Artaphernes. Aggabodhi VIII was King of Anuradhapura in the 9th century, whose reign lasted from 816 to 827.  He succeeded his brother Mahinda III as King of Anuradhapura and was succeeded by his brother Dappula III. The Jacobean style is the second phase of Renaissance architecture in England, following the Elizabethan style.  It is named after King James I of England, with whose reign (1603-1625 in England) it is associated.  At the start of James' reign there was little stylistic break in architecture, as Elizabethan trends continued their development.  However his death in 1625 came as a decisive change towards more classical architecture, with Italian influence, was in progress, led by Inigo Jones; the style this began is sometimes called Stuart architecture, or English Baroque (though the latter term may be regarded as starting later). Stephen (French: "Étienne" ;  1092/6  – 25 October 1154), often referred to as Stephen of Blois, was King of England from 1135 to his death, as well as Count of Boulogne from 1125 until 1147 and Duke of Normandy from 1135 until 1144.  Stephen's reign was marked by the Anarchy, a civil war with his cousin and rival, the Empress Matilda.  He was succeeded by Matilda's son, Henry II, the first of the Angevin kings. England in the High Middle Ages includes the history of England between the Norman Conquest in 1066 and the death of King John, considered by some to be the last of the Angevin kings of England, in 1216.  A disputed succession and victory at the Battle of Hastings led to the conquest of England by William of Normandy in 1066.  This linked the crown of England with possessions in France and brought a new aristocracy to the country that dominated landholding, government and the church.  They brought with them the French language and maintained their rule through a system of castles and the introduction of a feudal system of landholding.  By the time of William's death in 1087, England formed the largest part of an Anglo-Norman empire, ruled by nobles with landholdings across England, Normandy and Wales.  William's sons disputed succession to his lands, with William II emerging as ruler of England and much of Normandy.  On his death in 1100 his younger brother claimed the throne as Henry I and defeated his brother Robert to reunite England and Normandy.  Henry was a ruthless yet effective king, but after the death of his only male heir in the White Ship tragedy, he persuaded his barons to recognise his daughter Matilda as heir.  When Henry died in 1135 her cousin Stephen of Blois had himself proclaimed king, leading to a civil war known as The Anarchy.  Eventually Stephen recognised Matilda's son Henry as his heir and when Stephen died in 1154, he succeeded as Henry II. Ragnvald Knaphövde was a King of Sweden whose reign is estimated to have occurred in the mid-1120s or c. 1130.  His cognomen "Knaphövde" is explained as referring to a drinking vessel, the size of a man's head or meaning "round head" and referring to his being foolish.  Ragnvald is mentioned in the regnal list of the "Westrogothic law" as the successor of King Inge the Younger.

Supporting sentences:
 When Henry died in 1135 her cousin Stephen of Blois had himself proclaimed king, leading to a civil war known as The Anarchy. Stephen (French: "Étienne" ;  1092/6  – 25 October 1154), often referred to as Stephen of Blois, was King of England from 1135 to his death, as well as Count of Boulogne from 1125 until 1147 and Duke of Normandy from 1135 until 1144.  Stephen's reign was marked by the Anarchy, a civil war with his cousin and rival, the Empress Matilda.