The wager of battle was not long in experiencing the first assaults of the new power. The earliest efficient steps towards its abolition were taken in 1231 by the Emperor Frederic II. in his Neapolitan code. He pronounces it to be in no sense a legal proof, but only a species of divination, incompatible with every notion of equity and justice; and he prohibits it for the future, except in cases of poisoning or secret murder and treason where other proof is unattainable; and even in these it is placed at the option of the accuser alone; moreover, if the accuser commences by offering proof and fails he cannot then have recourse to combat; the accused must be acquitted.[712] The German Imperial code, known as the Kayser-Recht, which was probably compiled about the same time, contains a similar denunciation of the uncertainty of the duel, but does not venture on a prohibition, merely renouncing all responsibility for it, while recognizing it as a settled custom.[713] In the portion, however, devoted to municipal law, which is probably somewhat later in date, the prohibition is much more stringently expressed, manifesting the influences at work;[714] but even this is contradicted by a passage almost immediately preceding it. How little influence these wise counsels had, in a state so intensely feudal and aristocratic, is exemplified in the Suabian and Saxon codes, where the duel plays so important a part. Yet the desire to escape it was not altogether confined to the honest burghers of the cities, for in 1277 Rodolph of Hapsburg, even before he granted immunity to the imperial towns, gave a charter to the duchy of Styria, securing to the Styrians their privileges and rights, and in this he forbade the duel in all cases where sufficient testimony could be otherwise obtained; while the general tenor of the document shows that this was regarded as a favor.[715] The Emperor Albert I. was no less desirous of restricting the duel, and in ordinary criminal cases endeavored to substitute compurgation.[716] Still, as late as 1487, the Inquisitor Sprenger, in discountenancing the red-hot iron ordeal in witch-trials, feels himself obliged to meet the arguments of those who urged the lawfulness of the duel as a reason for permitting the cognate appeal to the ordeal. To this he naïvely replies, as Thomas Aquinas had done, that they are essentially different, as the champions in a duel are about equally matched, and the killing of one of them is a simple affair, while the iron ordeal, or that of drinking boiling water, is a tempting of God by requiring a miracle.[717] This shows at the same time how thoroughly the judicial combat had degenerated from its original theory, and that the appeal to the God of battles had become a mere question of chance, or of the comparative strength and skill of a couple of professional bravos.