1154

1154 is a natural number that follows 1153 and precedes 1155. In mathematics, it is an even composite number with prime factorization 2 × 577, where 577 is prime. Therefore, 1154 is a semiprime. In Roman numerals, it is written as MCLIV.

The number 1154 also designates a year in the common era. In 1154, the English monarchy saw a significant transition with the death of Stephen of Blois and the accession of Henry II, effectively ending the period of civil war known as The Anarchy and beginning the Angevin era. Henry II was crowned later in the year at Westminster Abbey, reinforcing the expansion of the Plantagenet realm. The year sits in the broader context of the High Middle Ages in Europe, a time of political consolidation and growing administrative centralization in several kingdoms.

In calendar terms, 1154 was not a leap year in the Julian calendar, which was in use at the time. The year is often cited in historical timelines for its role in solidifying Henry II’s rule and the gradual shift toward centralized royal authority in England, as well as for its place within medieval European political development.