Origins
Chancellor is a title of office whose history is one of the most striking cases of promotion in the Western vocabulary: from a humble Roman doorkeeper to a head of state or head of government. In modern English it denotes, variously, the chief financial minister of the United Kingdom (Chancellor of the Exchequer), the presiding head of a university, the head of government in Germany and Austria (Bundeskanzler, Bundeskanzlerin), a senior judge in certain jurisdictions (Lord High Chancellor), and the equity judge in older English chancery courts. The word comes through Anglo-Norman chanceler from Late Latin cancellārius, an official stationed at the cancellī — the lattice or crossbar screen that separated judge and clerks from the public in a Roman basilica. The journey from lattice-keeper to Kanzler spans fifteen centuries and tracks the expansion of written bureaucracy in Latin Europe.
Classical Latin cancellī is the diminutive plural of cancer, cancri, "a lattice, grating, crossbars," itself a dissimilated form of carcer, "enclosure, prison" (the same root that, through another path, gives English incarcerate and French chancre). The cancellī were the wooden or iron crossbars that fenced off restricted areas in a courthouse, church, or palace — the ancestor of our chancel in a church (the railed area around the altar). A cancellārius, in the Codex Theodosianus and the Codex Justinianus, was at first simply the officer who stood at the railing: porter, usher, bailiff. By the late Roman and early Byzantine period the cancellārius had responsibilities that drifted inward — drafting letters, keeping seals, controlling access — and by the Merovingian and Carolingian chanceries the title had become that of the chief scribe and secretary, custodian of the royal seal and the written acts of the king. Einhard's Life of Charlemagne already uses the word in something close to its medieval sense.
In England the office arrives with the Normans. William I appointed a chancellor (chanceler in Anglo-Norman) to keep the Great Seal and supervise the writs issuing from the king's court; by Henry II's reign the Chancellor was one of the three great officers of state alongside the Justiciar and the Treasurer. Because so many early chancellors were also clerics trained in canon law, the chancellor's court — the Chancery — developed its own equitable jurisdiction, eventually producing the elaborate procedure that Charles Dickens satirised in Bleak House (1853), where Jarndyce and Jarndyce consumes generations in the Lord Chancellor's court. Chaucer refers to the chanceler in the fourteenth century, and Shakespeare's Cardinal Wolsey in Henry VIII holds the office with great pomp. Samuel Johnson's Dictionary (1755) defines chancellor succinctly as "the highest officer of the crown."
Latin Roots
Cognates in the other Germanic and Romance languages show parallel developments from the same Latin etymon: French chancelier, Italian cancelliere, Spanish canciller, Portuguese chanceler, Catalan canceller; German Kanzler, Dutch kanselier, Danish kansler, Swedish kansler, Polish kanclerz, Russian канцлер (kantsler), Hungarian kancellár. In German the word underwent its own striking promotion: what was once the chief clerk of an imperial chancery became, through the Reichskanzler of the North German Confederation (1867) and then of Bismarck's German Empire (1871), the head of government of the modern Federal Republic. The titles Reichskanzler, Bundeskanzler, Vize-Kanzler, and the derivation Kanzlei (chancery, office) all descend from the same cancellī. Related English words from the same Latin root include chancel (the railed part of a church), chancery, cancel (originally to cross out with lattice-lines), and cancellate.
In contemporary English the word retains multiple live senses, and its semantic range reflects the diverging fortunes of the office across Europe. In the United Kingdom the Chancellor of the Exchequer is the treasury minister, a role which dates back to the twelfth-century Exchequer and whose earliest recorded holder is Eustace of Fauconberg under Henry III; the Lord Chancellor, once the senior judge and speaker of the House of Lords, is now primarily Secretary of State for Justice following the Constitutional Reform Act 2005. Universities in Britain and the Commonwealth retain a ceremonial Chancellor and a working Vice-Chancellor, a division of office that reflects the medieval origins of the title within cathedral schools and the great universities of Paris, Oxford, and Cambridge. In the United States, chancellor denotes the chief executive of some state university systems or the presiding judge of certain equity courts (Delaware Court of Chancery, New Jersey's former chancery division, Tennessee chancery courts). In continental Europe, chancellor is the standard title of the head of government in Germany, Austria, and (historically) several other polities, and in diplomatic usage the Chancery remains a common name for an embassy's administrative wing. A piece of early semantic drift still visible in English is the verb cancel, where the Roman practice of scoring out text with a lattice of lines — literally applying little cancellī to a document — survives as the idiom of deletion. From the lattice barrier to the erasure of a booking, the word has quietly shaped five distinct families of modern vocabulary.