In November 1274 it was decided by the diet at Nuremberg that all crown estates seized since the death of the emperor Frederick II.
Louis accompanied the Crusaders to Damietta in 1221, and governed Germany as regent from 1225 until 1228, when he deserted Frederick II.
He was attached to the Hohenstaufen by the marriage of his daughter, Elizabeth, with Conrad, son of Frederick II.
The fruitless siege of Parma in 1248 was the last effort of Frederick II.
The thirty years which elapsed between Frederick Barbarossas death in 1190 and the coronation of his grandson Frederick II.