The Statutum in favorem principum ("Statute in favour of the princes") of 1231, reaffirmed in 1232, counts as one of the most important sources of law of the Holy Roman Empire on German territory.
In May 1231 Frederick II's son Henry, King of Germany, issued the grant under pressure from the German secular princes during his rebellion against his father.
In this law, the Emperor relinquished a number of important Royal rights ("Regalia") to the secular princes.
Among other things, they received the rights to mint coins and levy tolls in the German part of the Holy Roman Empire.
The decreeing of this law together with the previous Confoederatio made the power and influence of the territorial princes in relation to the Empire and the towns extraordinarily great.