Why did Frederick II make concessions to the German princes in 1232?

In 1232, at the diet of Cividale, Frederick II confirmed a series of significant concessions to the German princes, known as the Statutum in Favorem Principum.12

These concessions were essentially a formal recognition of actions already taken by his son, the German king Henry VII, who had been ruling independently in Germany since 1228 and had granted similar privileges to the lay princes in 1231. By formalizing these agreements, Frederick II provided the territorial lords with written guarantees that limited the interference of royal demesne officials in their lands and restricted the development of imperial towns at the expense of episcopal territories.3124

These measures were part of a broader trend in which the emperor sought to manage the complex political landscape of the empire while focusing on his interests in Italy and his struggles with the papacy. Ultimately, these concessions strengthened the power of the princes at the expense of central imperial authority, furthering the independence of the principalities and setting back the development of communal self-government in Germany.12