» Also see: number 1440. Year 1440 (MCDXL) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. Events of 1440 February 21 – The Prussian Confederation's formed. September 13 – Gilles de Rais's taken into custody upon an accusation brought against him by the Bishop of Nantes. October 22 – Gilles de Rais confesses and's sentenced to death. Undated Itzcóatl, Aztec ruler of Tenochtitlan, dies and's succeeded by Moctezuma I (… (More on 1440)