1217

1217 is the natural number following 1216 and preceding 1218. It is a prime number. In various numeral systems, it is written as MCCXVII in Roman numerals, 10011000001 in binary, and 0x4C1 in hexadecimal.

As a year, 1217 falls in the early 13th century. In England, it is remembered for events related to the First Barons' War following the death of King John in 1216. The Battle of Lincoln on 20 May 1217 was a decisive royalist victory, with forces loyal to the young king, Henry III, led by William Marshal, defeating the army of Prince Louis of France and his English supporters. Later that year, the Treaty of Lambeth helped end major hostilities and led to Louis withdrawing from England, while Henry III’s reign was solidified.

In the broader medieval world, 1217 sits within a period of ongoing dynastic and papal influence across Europe. The papacy at the time was under Honorius III, and European politics continued to involve competing royal and noble interests as well as Crusade-related efforts and ecclesiastical authority. The year thus reflects the volatile transition from the late high medieval conflicts of the generation that followed the signing of Magna Carta toward a more consolidated medieval monarchy in England and evolving power dynamics on the continent.