1457

1457 may refer to the year AD 1457 or to the integer 1457. In Roman numerals, 1457 is written as MCDLVII. As a positive integer, 1457 factors into 31 × 47, making it a semiprime.

The year 1457 sits in the late Middle Ages and is associated with ongoing regional conflicts in Europe. The Thirteen Years' War between the Kingdom of Poland and the Teutonic Knights was active, with battles and political maneuvering over Prussia. In England, the Wars of the Roses were underway, a struggle between the houses of York and Lancaster that shaped politics across the realm. In the Balkans, the Ottoman Empire under Mehmed II continued to consolidate power following the conquest of Constantinople in 1453 and conducted campaigns in the surrounding regions.

Cultural and technological developments of the period included the spread of movable-type printing technologies. The innovations of the early 1450s enabled the production of books at unprecedented scale, and printing presses began to spread to additional cities in the Holy Roman Empire and beyond by the latter half of the decade.

In mathematics, 1457 is notable as a composite number and a product of two primes, 31 and 47. Beyond these properties, the year is often referenced in historical overviews to illustrate late medieval political realignments, cultural transitions, and the broader patterns of 15th-century Europe and neighboring regions.