1173

1173 is an integer. In mathematics its prime factorization is 3 × 17 × 23, making it the product of three distinct primes. It is an odd composite number, not a prime or a perfect power. In Roman numerals it is written as MCLXXIII, and in binary it is 10010010101.

Year 1173 CE was a common year in the Julian calendar. The most notable political event was the Revolt of 1173–1174 within the Angevin Empire, when Henry II of England faced a major rebellion led by his sons Henry the Young King, Geoffrey, and Richard the Lionheart, with support from their mother Eleanor of Aquitaine and from Louis VII of France. The uprising challenged royal authority in England and across western dominions such as Normandy and Anjou. The revolt was ultimately suppressed by 1174, and Henry II retained the bulk of his realm, though the episode influenced ongoing tensions between the crown and the princes.

Beyond this revolt, historical records from 1173 are more limited in widely cited sources, but the year sits within a broader pattern of dynastic and territorial politics that characterized medieval Europe. The events of 1173

- illustrate how succession disputes and familial alliances could intersect with imperial authority and regional power struggles. In mathematics and history alike, 1173 remains a reference point as a composite number and as a year in the 12th century.