1216

1216 is the year in the Julian calendar often discussed in the context of early 13th-century Europe. In England, it is marked by the death of King John on 19 October and the accession of his nine-year-old son, Henry III. A regency governed the realm, headed by William Marshal, the Earl of Pembroke, as the country continued to deal with ongoing civil conflict known as the First Barons’ War. The baronial opposition to royal authority and to the arrangements surrounding the succession shaped events during the year and into the following period. The year thus stands as a turning point in the political and constitutional developments of medieval England, illustrating the fragility of royal authority during a monarch’s minority and the enduring tensions between crown and nobility.

1216 is also a number with specific mathematical properties. It factors as 2^6 × 19, making it an even, non-square composite with 14 positive divisors. The Euler totient of 1216 is 576, and the sum of its divisors is 2540. In Roman numerals, 1216 is written as MCCXVI. It lies between 34^2 (1156) and 35^2 (1225) on the number line. These characteristics are typical reference points in elementary number theory when discussing prime factorization, divisor counts, and related arithmetic functions.