Year 1452 (MCDLII) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. Events of 1452 he was a great man Frederick III, Holy Roman Emperor becomes the last to be crowned in Rome. Portuguese navigator Diogo de Teive discovers Corvo Island in the Azores. 18 June – Pope Nicholas V issues the bull Dum Diversas, legitimising the colonial slave trade. October – English troops under John Talbot, 1st Earl of Shrewsbury, land in Guyenne, Fran… (More on 1452)