1149

1149 can refer to more than one thing, including the integer itself and a year in history. In mathematics, 1149 is an odd composite number with prime factorization 3 × 383, making it a semiprime. Its digit sum is 15, so it is divisible by 3 but not by 9. In Roman numerals it is written as MCXLIX. In hexadecimal it is 0x047D, and in binary it equals 10001111101.

As a year, 1149 CE sits in the middle of the 12th century. It falls within the era of the Crusades in both Europe and the Levant, with the Second Crusade spanning roughly 1147–1149. The year is commonly placed in historical timelines as part of medieval European and Near Eastern history, a period marked by political realignments, monastic and urban development in Europe, and ongoing military campaigns in the eastern Mediterranean. While specific events from 1149 can vary by source, the year is typically associated with the broader dynamics of 12th-century Christendom and its interactions with neighboring realms.