Imperial immediacy (German: Reichsfreiheit or Reichsunmittelbarkeit) was a privileged constitutional and political status rooted in German feudal law under which the Imperial estates of the Holy Roman Empire such as Imperial cities, prince-bishoprics and secular principalities, and individuals such as the Imperial knights, were declared free from the authority of any local lord and placed under the direct ("immediate", in the sense of "without an intermediary") authority of the Emperor, and later of the institutions of the Empire such as the Diet (Reichstag), the Imperial Chamber of Justice and the Aulic Council.
The granting of immediacy began in the Early Middle Ages, and for the immediate bishops, abbots and cities, then the main beneficiaries of that status, immediacy could be exacting and often meant being subjected to the fiscal, military and hospitality demands of their overlord, the Emperor. However, with the gradual exit of the Emperor from the centre stage from the mid-13th century onwards, holders of imperial immediacy eventually found themselves vested with considerable rights and powers previously exercised by the emperor.
As confirmed by the Peace of Westphalia in 1648, the possession of imperial immediacy came with a particular form of territorial authority known as territorial superiority (Landeshoheit or superioritas territorialis in German and Latin documents of the time). In today's terms, it would be understood as a limited form of sovereignty.
Several immediate estates held the privilege of attending meetings of the Reichstag in person, including an individual vote (votum virile):
Further immediate estates not represented in the Reichstag were the Imperial Knights as well as several abbeys and minor localities, the remains of those territories which in the High Middle Ages had been under the direct authority of the Emperor and since then had mostly been given in pledge to the princes.
Additional advantages might include the rights to collect taxes and tolls, to hold a market, to mint coins, to bear arms, and to conduct legal proceedings. The last of these might include the so-called Blutgericht ("blood justice") through which capital punishment could be administered. These rights varied according to the legal patents granted by the emperor.
As pointed out by Jonathan Israel  in 1528 the Dutch province of Overijssel tried to arrange its submission to Emperor Charles V in his capacity as Holy Roman Emperor rather than as his being the Duke of Burgundy. If successful, that would have evoked Imperial immediacy and would have put Overijssel in a stronger negotiating position, for example given the province the ability to appeal to the Imperial Diet in any debate with Charles. For that reason, the Emperor strongly rejected and blocked Overijssel's attempt.
Disadvantages might include direct intervention by imperial commissions, as happened in several of the south-western cities after the Schmalkaldic War, and the potential restriction or outright loss of previously held legal patents. Immediate rights might be lost if the Emperor and/or the Imperial Diet could not defend them against external aggression, as occurred in the French Revolutionary wars and the Napoleonic Wars. The Treaty of Lunéville in 1801 required the emperor to renounce all claims to the portions of the Holy Roman Empire west of the Rhine. At the last meeting of the Imperial Diet (German: Reichsdeputationshauptschluss) in 1802–03, also called the German Mediatisation, most of the free imperial cities and the ecclesiastic states lost their imperial immediacy and were absorbed by several dynastic states.
The practical application of the rights of immediacy was complex; this makes the history of the Holy Roman Empire particularly difficult to understand, especially for modern historians. Even such contemporaries as Goethe and Fichte called the Empire a monstrosity. Voltaire wrote of the Empire as something neither Holy nor Roman, nor an Empire, and in comparison to the British Empire, saw its German counterpart as an abysmal failure that reached its pinnacle of success in the early Middle Ages and declined thereafter. Prussian historian Heinrich von Treitschke described it in the 19th century as having become "a chaotic mess of rotted imperial forms and unfinished territories". For nearly a century after the publication of James Bryce's monumental work The Holy Roman Empire (1864), this view prevailed among most English-speaking historians of the Early Modern period, and contributed to the development of the Sonderweg theory of the German past.
A revisionist view popular in Germany but increasingly adopted elsewhere argued that "though not powerful politically or militarily, [the Empire] was extraordinarily diverse and free by the standards of Europe at the time". Pointing out that people like Goethe meant "monster" as a compliment in modern understanding, The Economist has called the Empire "a great place to live ... a union with which its subjects identified, whose loss distressed them greatly" and praised its cultural and religious diversity, saying that it "allowed a degree of liberty and diversity that was unimaginable in the neighbouring kingdoms" and that "ordinary folk, including women, had far more rights to property than in France or Spain".
Furthermore, the prestige of the Emperor among the German people outweighed his lack of legal and military authority. One need find no better proof of this than the fact that the constitution of Germany remained little changed for centuries, with hundreds of tiny enclaves co-existing peacefully with much larger and often greedy and militaristic neighbors. Only external factors in form of the French military aggression during the Thirty Years' War and the Revolutionary period served to alter Germany's constitution. Napoleon's overthrow of the Empire in favor of his puppet Confederation of the Rhine was a deep moral blow to many Germans. The cringing attitude of the princes and their avaricious behavior during the mediatizations embarrassed the people and, however much they despised the Empire's weakness, it was still a great and old symbol of Germany. Such symbolism was revived in 1848, when the so-called Provisional Central Power of Germany chose 6 August 1848, the 42nd anniversary of the end of the Empire, as the day the soldiers of Germany should swear oaths of loyalty to the new situation (see Military Parade of August 6th), as well as the German Empire of 1871 referred to as The Second Reich.