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Year 1457 (MCDLVII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.
- February 11 – After years of captivity and absence from the Ming throne, the Zhengtong Emperor of China is reinstated, as the Tianshun Emperor.
- February 24 – Charles VIII of Sweden is declared deposed. The Archbishop of Sweden, Jöns Bengtsson Oxenstierna, and statesman Erik Axelsson Tott become co-regents of Sweden. The throne is then offered to Christian I of Denmark and Norway.
- March 6 – King James II of Scotland decrees that “. . . ye futebawe and ye golf be uterly cryt done and not usyt . . “ The first historical mention of the game of golf.
- April 12 – Ştefan cel Mare secures the throne of Moldavia, which he retains for the next 47 years.
- June 23 – Christian I is elected king of Sweden, ending the war between Sweden and Denmark and restoring the Kalmar Union.
- August 14 – The Mainz Psalter, the second major book printed with movable type in the West, the first to be wholly finished mechanically (including colour), and the first to carry a printed date, is printed for the Elector of Mainz.
- September 2 – Battle of Ujëbardha: One of Skanderbeg's most important victories is won against the Ottoman army, in the open field.