Overview
1153 is a natural number that follows 1152 and precedes 1154. It is also used to refer to the year 1153 in the Common Era (often written 1153 AD), a year that figures in medieval European political and ecclesiastical history. As a number it appears in arithmetic, numbering systems and as an identifier in modern lists and catalogues.
Mathematical characteristics
In arithmetic, 1153 is an odd integer and a prime number: it has no positive divisors other than 1 and itself. Its representation in Roman numerals is MCLIII. In common positional bases it is written as 10010000001 in binary and 0x481 in hexadecimal. Being prime, 1153 does not factor into smaller integer components.
Year 1153 (AD): political and religious events
The year 1153 is notable in 12th-century European affairs. In England, the prolonged civil conflict between King Stephen and supporters of the Empress Matilda—commonly called The Anarchy—moved toward resolution when leading nobles reached an agreement recognizing Henry of Anjou (the future Henry II) as Stephen’s heir, effectively ending overt hostilities and setting the stage for the Plantagenet succession.
In Scotland, King David I, a major figure in the consolidation of the Scottish monarchy and the introduction of Norman institutions, died in 1153. He was succeeded by his grandson Malcolm IV, who was still a young man at the time and whose reign continued the processes of feudal and ecclesiastical reform begun under David.
In the papacy, the year saw the death of Pope Eugenius III and the election of his successor, an event of significance for church politics and relations between Rome and the various European monarchs.
Notable deaths and succession
- David I of Scotland — king and reformer, died in 1153.
- Pope Eugenius III — pontiff until his death in 1153; succeeded by his successor later that year.
Significance and legacy
Events of 1153 contributed to important transitions: the stabilization of royal succession in England that enabled the Plantagenet dynasty, continuity and reform in Scotland under a new king, and ongoing developments in papal authority. As a number, 1153 is primarily of interest in contexts where primality or specific numeric identifiers are relevant.