Imperial Reform (, ) is the name given to repeated attempts in the 15th and 16th centuries to adapt the structure and the constitutional order () of the Holy Roman Empire to the requirements of the early modern state and to give it a unified government under either the Imperial Estates or the emperor's supremacy.

First attempts From 1434 to 1438, at imperial diets in Eger and Nuremberg, the first attempts at Imperial Reform were undertaken, partly on the initiative of Emperor Sigismund, partly by the prince-electors. Feuds were banned, and discussions were held on a revision of the rights of coinage and escort () and an administrative division of the Empire into imperial circles. All the proposals foundered, however, on the opposing interests of emperor and imperial princes.

Both parties were striving to create a more workable government of the empire, but they were working in opposite directions. The emperor was interested in strengthening his central control; the princes wanted collegiate, corporate leadership in which they could participate. The journals of the time, including publications like the , show that the educated classes that represented the small territorial lordships of the counts and barons () as well as the imperial knights but also the imperial cities and the smaller ecclesiastical territories supported the emperor having a powerful position, because it offered better protection against the demands of their own lords. The emperor himself, however, who from the time of Sigismund's successor, Albert II, almost always came from the House of Habsburg, used imperial politics generally only if it served to support his own personal base of power at home.

Reform measures from 1495 In 1495, an attempt was made at an Imperial Diet in the city of Worms to give the disintegrating Holy Roman Empire a new structure, commonly referred to as Imperial Reform. The fundamental idea of the reform was largely based on the theory of political concordance between the emperor and the Imperial States, developed by Nicholas of Kues.

After the fall of the House of Hohenstaufen in the mid-13th century, the power of the emperors gradually declined in favour of the Estates of the Realm, especially of the prince-electors assigned by the Golden Bull of 1356. The autonomous estates had nevertheless become painfully aware of the disadvantages of the absence of a centralised authority on the occasions of threats and armed conflicts like the Hussite Wars.

Maximilian I of Austria was elected King of the Romans from 1486. At the 1495 Diet, Maximilian asked the representatives of the estates not only for contributions but also for an imperial tax to be raised and for troops to be committed for his wars against the Ottomans in the East and the French in Italy. The deputies, led by Chancellor Bertold von Henneberg-Römhild, the Archbishop of Mainz, agreed in principle to a Common Penny tax paid directly to the Empire, but in return set conditions:

The constitution of an Imperial Government, which placed power in the hand of the princes, with the emperor as an honorary chairman. Maximilian refused this restriction of his authority from outset, and did not consent until the Diet of Augsburg, 1500, after the states had conceded their own Landsknecht troops to him, only to abolish the Government two years later. The Perpetual Public Peace established the Empire as a single body of law that excluded feuds as means of politics between the vassals. Reception of Roman law: Roman law was adopted as the official law for the whole Empire The related installation of the Reichskammergericht (Imperial Chamber Court), a supreme court for all of the Empire's territory. This Court originally had its seat at Frankfurt am Main; it moved to Speyer in 1523 and finally to Wetzlar in 1693

Maximilian generally opposed the institutions that weakened his power, but he supported the Land Peace, adoption of Roman law, sounder administrative procedures, better record-keeping, qualifications for offices, etc. Responding to the proposal that an Imperial Council (the later Reichsregiment) should be created, he agreed and welcomed the participation of the Estates, but he alone should be the one who appointed members, and the council should function only during his campaigns. He supported modernizing reforms (which he himself pioneered in his Austrian lands) but also wanted to tie them to his personal control, above all by permanent taxation, which the Estates consistently opposed. In 1504, when he was strong enough to propose his own ideas for such a Council, the cowered Estates tried to resist. At his strongest point, though, he still failed to find a solution for the common tax matter, which led to disasters in Italy later. Meanwhile, he explored Austria's potential as a base for Imperial power and built his government largely with officials drawn from the lower aristocracy and burghers in Southern Germany.

Reception of Roman Law

At the 1495 Diet, the Reception of Roman Law was accelerated and formalized. The Roman law was made binding in German courts, except in the case it was contrary to local statutes. In practice, it became the basic law throughout Germany, displacing Germanic local law to a large extent, although Germanic law was still operative at the lower courts. Other than the desire to achieve legal unity and other factors, the adoption also highlighted the continuity between the ancient Roman Empire and the Holy Roman Empire. To realize his resolve to reform and unify the legal system, the emperor frequently intervened personally in matters of local law, overriding local charters and customs. This practice was often met with irony and scorn from local councils, who wanted to protect their local codes.

The legal reform seriously weakened the ancient Vehmic court (), or Secret Tribunal of Westphalia, traditionally held to be instituted by Charlemagne but this theory is now considered unlikely.), although it would not be abolished completely until 1811 (when it was abolished under the order of Jérôme Bonaparte).

Further development

In 1500 six (from 1512 on: ten) Imperial Circles were established with their own Circle Diets. The Circles, originally meant as constituencies of the Imperial Government, enabled a more uniform administration of the Empire to better execute the Perpetual Public Peace, taxation, and the raising of troops. The establishment of the Imperial Circles was a long-overdue response to the administrative impotence of the Empire at the local level regarding the questions of levies, implementation of justice, customs, beggars, poor people, and healthcare (implemented by medical police, or , who took care of the drinking water supply and protection against epidemics). After some time, they also took responsibility for the construction of cross-border highways and roads, as well as many other matters in the early modern civilization process. Wolfgang Wüst opines that even if some aspects remained incomplete, the formation of the Imperial Circles proved to be an essential influence on the development of Early Modern Europe.

Maximilian responded to the by establishing the concurrent Aulic Council (, ) in 1497. Throughout the modern period, the Aulic Council remained by far the faster and more efficient among the two Courts. The on the other hand was often torn by matters related to confessional alliance. Around 1497–1498, as part of his administrative reforms, he restructured his Privy Council (), a decision which today induces much scholarly discussion. Apart from balancing the with the , this act of restructuring seemed to suggest that, as Westphal quoting Ortlieb, the "imperial ruler – independent of the existence of a supreme court – remained the contact person for hard pressed subjects in legal disputes as well, so that a special agency to deal with these matters could appear sensible" (as also shown by the large number of supplications he received).

According to Thomas Brady Jr. and Jan-Dirk Müller, the most important governmental changes targeted the heart of the regime: the chancery. Early in Maximilian's reign, the Court Chancery at Innsbruck competed with the Imperial Chancery (which was under the elector-archbishop of Mainz, the senior Imperial chancellor). By referring the political matters in Tyrol, Austria as well as Imperial problems to the Court Chancery, Maximilian gradually centralized its authority. The two chanceries became combined in 1502. Jan-Dirk Müller opines that this chancery became the decisive government institution since 1502. In 1496, the emperor created a general treasury () in Innsbruck, which became responsible for all the hereditary lands. The chamber of accounts () at Vienna was made subordinate to this body. Under , the was entrusted with not only hereditary lands' affairs, but Maximilian's affairs as the German king too.

Maximilian tried to direct the reform according to his monarchical-centralization agenda. Whaley notes that the real foundation of his Imperial power lay with his networks of allies and clients, especially the less powerful Estates, who helped him to recover his strength in 1502 – his first reform proposals as King of the Romans in 1486 were about the creation of a network of regional unions. According to Whaley, "More systematically than any predecessor, Maximilian exploited the potential of regional leagues and unions to extend imperial influence and to create the possibility of imperial government in the Reich." To the Empire, the mechanisms involving such regional institutions bolstered the Eternal Land Peace () declared in 1495 as well as the creation of the Imperial Circles between 1500 and 1512, although they were only fully functional some decades later.

The Swiss Confederacy did not accept the resolutions of the Imperial Diet and explicitly refused to pay the Common Penny, one of the circumstances leading to the Swabian War of 1499 and the Confederacy's exemption from imperial legislation. Due to the obstinate resistance of several States, the collection of the tax was finally suspended in 1505.

The reform was more or less concluded with the Imperial Execution Order of 1555, part of the Peace of Augsburg, which regulated more details of the responsibilities of the Imperial Circle Estates.

Emergence of a national political culture

Maximilian and Charles V (despite the fact both emperors were internationalists personally) were the first who mobilized the rhetoric of the Nation, firmly identified with the Reich by the contemporary humanists. With encouragement from Maximilian and his humanists, iconic spiritual figures were reintroduced or became notable. The humanists rediscovered the work Germania, written by Tacitus. According to Peter H. Wilson, the female figure of Germania was reinvented by the emperor as the virtuous pacific Mother of Holy Roman Empire of the German Nation. Whaley further suggests that, despite the later religious divide, "patriotic motifs developed during Maximilian's reign, both by Maximilian himself and by the humanist writers who responded to him, formed the core of a national political culture."

Maximilian's reign also witnessed the gradual emergence of the German common language, with the notable roles of the imperial chancery and the chancery of the Wettin Elector Frederick the Wise. The development of the printing industry together with the emergence of the postal system (the first modern one in the world), initiated by Maximilian himself with contribution from Frederick III and Charles the Bold, led to a revolution in communication and allowed ideas to spread. Unlike the situation in more centralized countries, the decentralized nature of the Empire made censorship difficult.