The legacy of Maximilian I, Holy Roman Emperor has had many effects on the world. Despite his reputation as "the last knight" (and his penchant for personally commanding battles and leading a peripatetic court), as a politician, Maximilian also carried out "herculean tasks of bureaucracy" every day of his adult life (the emperor boasted that he could dictate, simultaneously, to half a dozen secretaries). At the same time, James M. Bradburne remarks that, "Naturally every ruler wanted to be seen as a victor, but Maximilian aspired to the role of Apollo Musagetes." The circle of humanists gathered around him and other contemporary admirers also tended to depict him as such. Maximilian was a universal patron, whose intellect and imagination, according to historian Sydney Anglo, made the courtier of Castiliogne look like a scaled-down version. Anglo points out, though, that the emperor treated his artists and scholars like mere tools (whom he also tended to fail to pay adequately or timely) to serve his purposes, and never autonomous forces. Maximilian did not play the roles of the sponsor and commissioner only, but as organizer, stimulator and planner, he joined the creative processes, drew up the programmes, suggested improvements, checked and decided on the details, invented devices, almost regardless of the time and material resources required. His creativity was not limited to the practical issues of politics, economy and war, but extended to the areas of arts, sciences, hunting, fishing and especially technical innovations, inclụding the creation of all kinds of military equipment, fortifications, precious metal processing or the mining industry. These activities though were time-consuming and the effort the emperor poured in such activities was sometimes criticized as excessive, or that they distracted him from the main tasks of a ruler. In the nineteenth century and early twentieth century, some even criticized him for possessing the qualities that befitted a genius more than a ruler, or that his intellect that saw too far made him unwisely try to force the march of time.

Military innovation, chivalry, and equipment

Maximilian was a capable commander and a military innovator who contributed to the modernization of warfare, although he lost many wars, usually due to the lack of financial resources. The notable commentators of his time, including Machiavelli, Piero Vettori and Guicciardini rated him as a great general, or in the words of Machiavelli, "second to none", but pointed out that extravagance, terrible management of financial resources and other character defects tended to lead to the failures of grand schemes. According to Matthias Pfaffenbichler, he did not accept the truth that war depended on money, and thus the problem was that despite his military-tactical talents, he rarely managed to convert military victories into long-term political successes. He and his condottiero George von Frundsberg organized the first formations of the Landsknechte based on inspiration from Swiss pikemen, but increased the ratio of pikemen and favoured handgunners over the crossbowmen, with new tactics being developed, leading to improvement in performance. Discipline, drilling and a highly developed staff by the standard of the era were also instilled. The "war apparatus" he created later played an essential role in Austria's rank as great power. Maximilian was the founder and organiser of the arms industry of the Habsburgs. He started the standardization of the artillery (according to the weight of the cannonballs) and made them more mobile. He sponsored new types of cannons, initiated many innovations that improved the range and damage so that cannons worked better against thick walls, and concerned himself with the metallurgy, as cannons often exploded when ignited and caused damage among his own troops. According to contemporary accounts, he could field an artillery of 105 cannons, including both iron and bronze guns of various sizes. The artillery force is considered by some to be the most developed of the day. The arsenal in Innsbruck, created by Maximilian, was one of the most notable artillery arsenals in Europe. ePDF: . His typical tactic was: artillery should attack first, the cavalry would act as shock troops and attack the flanks, infantry fought in tightly knitted formation at the middle.

A figure who contributed greatly to the development of the Innsbruck arsenal was Gregor Löffler. He entered Maximilian's service in 1513, following in the footsteps of his father Peter; his son Hans Christoph would also be the leading gunfounder in Europe. Löffler was the first gun master who became an arms manufacturer (who produced weapons on an industrial scale), and was also responsible for casting many of the statues in Maximilian's cenotaph. In addition to the central arsenal in Innsbruck, Maximilian built a chain of arsenals to protect his border: those in Sigmundskron and Trent against Italians, in Lindau against the Swiss, in Breisach against the French, in Vienna against the Hungarians, in Graz, Hochosterwitz, Laibach, Gorizia against the Turks and Venetians. In addition, there were the old Burgundian arsenals against France. On the other hand, Wilfried Tittmann stresses the central importance of the arms manufacturing center in Nuremberg (where the earliest handguns, which proved suitable for the field and export, were developed), not only concerning Maximilian's military system but also the early modern military revolution in general. Puype notices that Tittmann and Eugen Heer share the view that Maximilian's industrialization policy made Nuremberg "the metropole of the Upper German armament industry." Marius Mutz opines that Tittmann's demonstration of Nuremberg's importance is generally convincing, but that some of his points, notably that Hans Kalteisen (who served Maximilian and was Löffler's rival) had a Nuremberg origin or that developments in Innsbruck were based on Nuremberg's technology as well, are a bit overambitious.

Maximilian was described by the nineteenth-century politician Anton Alexander Graf von Auersperg as "the last knight" (der letzte Ritter), and this epithet has stuck to him. Some historians note that the epithet rings true yet is ironic, because, as the father of the Landsknechte (of which the paternity he shared with George von Frundsberg) and "the first cannoneer of the nation", he ended the combat supremacy of the cavalry, and his death heralded the military revolution of the next two centuries. Moreover, his multifaceted reforms broke the back of the knight class both militarily and politically. He threw his own weight behind the promotion of the infantry soldier, leading them in battles on foot with a pike on his shoulder and giving the commanders honours and titles. To Maximilian, the rise of the new martial ethic including even its violent aspect—associated with the rise of the Landsknechte, was also an unextractable part of his own masculine identity. He believed that fighting alongside his foot soldiers legitimized his right to rule more than did any noble trapping or title. In his time, though, social tensions were brewing, and the nobles resisted this belief. At the Siege of Padua 1509, commanding a French-German allied army, Maximilian ordered the noble knights to dismount to help the Landsknechte to storm a breach, but Chevalier Bayard criticized him for putting noblemen at risk alongside "cobblers, blacksmiths, bakers, and laborers, and who do not hold their honor in like esteem as gentlemen." Even merely mixing the two on the same battlefield was considered insulting. The French then refused to obey. The siege broke when the German knights refused to continue their assaults on foot and demanded to fight on horseback, also on basis of status. A furious Maximilian left the camp and ordered the army to retreat.

With Maximilian's establishment and use of the Landsknechte, the military organisation in Germany was altered in a major way. Here began the rise of military enterprisers, who raised mercenaries with a system of subcontractors to make war on credit, and acted as the commanding generals of their own armies. Maximilian became an expert military enterpriser himself, leading his father to consider him a spendthrift military adventurer who wandered into new wars and debts while still recovering from the previous campaigns.

Regarding the cavalry, in 1500, using the French gendarmes as a model, he organized his heavy cavalry, called the kyrisser. These cavalrymen, still mostly noblemen, were still fully armed, but more lightly—these were the predecessors of cuirassiers. Non-nobles began to be accepted into the cavalry (mostly serving as light cavalry—each lanze, or lance, contained one kyrisser and six to seven light cavalrymen) and occasionally, he knighted them too. For heavy as well as light cavalry, firearms began to replace cold weapons.

In military medicine, Maximilian introduced structured triage (triage itself had existed since the Ancient Egypt). It was in his armies that the wounded was first categorized and treated according to an order of priority—in times of war, higher priority was given to military personnel over civilians and the higher-ranked over the lower-ranked. The practice spread to other armies in the following centuries and coined "triage" by the French. During the Middle Age, European armies tended to bring with them workers who served the soldiers both as barbers (this was their chief function, thus the origin of their name in German, Feldscherer, or field shearer) and low-skilled paramedics (as opposed to a trained medicus) who worked on their external wounds. Beginning with Maximilian, each captain of a detachment (of 200–500 men) was compelled to bring a capable Feldscherer and provide him with medicine and equipments. These paramedics were subject to a level of control under a Oberfeldarzt (chief field doctor), although their organization was not stabilized until the seventeenth century and it also took a long time before the average level of these paramedics was raised substantially. The birth of the modern feldsher led to the formation of a military medical service, whose primary task, other than giving first aid, was to transport the wounded out of the battlefield as fast as possible with palanquins and wheelbarrows.

The emperor would not live to see the fruits of his military reforms, which were also widely adopted by the territories in the Empire and other nations in Europe. Moreover, the landsknechte's mode of fighting boosted the strength of the territorial polities, while more centralized nations were able to utilize them in ways German rulers could not. Kleinschmidt concludes that, in the end, Maximilian did good service to the competitors of his own grandson.

While favouring more modern methods in his actual military undertakings, Maximilian had a genuine interest in promoting chivalric traditions like the tournament, being an exceptional jouster himself. The tournaments helped to enhance his personal image and solidify a network of princes and nobles over whom he kept a close watch, fostering fidelity and fraternity among the competitors. Taking inspiration from the Burgundy tournament, he developed the German tournament into a distinctive entity. In addition, during at least two occasions in his campaigns, he challenged and killed French knights in duel-like preludes to battles.