15th May » Pope Innocent IV issues the papal bull 'ad extirpanda', which authorizes, but also limits, the torture of heretics in the Medieval Inquisition.
1st June » Alfonso X of Castile or Alfonso X is elected King of Castile and King of León or León.
Famous Birthdays in 1252
25th March » Conradin, German son of Conrad IV of Germany (d. 1268)
Famous Deaths in History for 1252
6th March » Rose of Viterbo, Italian saint (b. 1235)