Sumner notes that death by burning for heretics was made positive law by Pedro II of Aragon in 1197, in 1224 Frederick II, Holy Roman Emperor, made burning a legal alternative, and in 1238, it became the principal punishment in the Empire.
Death by burning for heretics was made positive law by Pedro II of Aragon in 1197. This was in 1224 Frederick II. This is what Sumner notes. This 1224 Frederick II was made burning a legal alternative.1224 Frederick II is Holy Roman Emperor. It became the principal punishment in the Empire. This was in 1238.