c. 2300 BCEEbla's bilingual word lists
Scribes at Ebla compile Sumerian–Eblaite lexical lists on clay — the oldest surviving bilingual dictionaries, made for working translators rather than scholars. Similar lists spread across Mesopotamia, where administration routinely ran in more than one language.
c. 250 BCEThe Septuagint in Alexandria
Jewish scholars in Ptolemaic Alexandria begin translating the Hebrew Bible into Greek. The Letter of Aristeas later wraps the project in legend — seventy-two translators, six from each tribe, working at Ptolemy II's request — giving the version its name, "the Seventy," and giving translation its first founding myth.
382–405 CEJerome translates the Vulgate
Commissioned by Pope Damasus I in 382 to sort out Latin scripture, Jerome learns Hebrew from Jewish scholars and translates the Old Testament from the original rather than from the Greek Septuagint — a controversial call he defended for decades. His Latin Bible became the Western standard for over a thousand years, and he became the patron saint of translators.
c. 850Hunayn ibn Ishaq in Baghdad
At the height of the Abbasid translation movement, the Nestorian Christian physician Hunayn ibn Ishaq renders roughly a hundred works of Galen into Syriac and Arabic, collating multiple Greek manuscripts before translating — textual criticism centuries ahead of its name. Later biographers claimed the caliph paid for translations with their weight in gold.
c. 1140–1187Gerard of Cremona at Toledo
An Italian scholar travels to newly reconquered Toledo looking for Ptolemy's Almagest, unavailable in Latin, and stays for life. Working with local Arabic speakers, Gerard translates more than seventy works of astronomy, medicine and mathematics from Arabic into Latin, making Toledo the channel through which Greek and Arabic science re-entered Europe.
1522Luther's eleven-week New Testament
Hiding in the Wartburg castle under an assumed name, Martin Luther translates the entire New Testament from Greek into German in about eleven weeks. The "September Testament" sells out instantly, and Luther's plain, spoken German — he insisted on listening to "the mother in the house, the children in the street, the common man in the market" — helps standardize the modern German language.
1840The Treaty of Waitangi's two versions
Missionary Henry Williams and his son Edward translate Britain's treaty with the Māori chiefs into Māori overnight, on 4–5 February. Their rendering of "sovereignty" as "kāwanatanga" (governorship), while guaranteeing chiefs "tino rangatiratanga" (full chieftainship), left the two texts promising different things — a translation gap New Zealand's courts and the Waitangi Tribunal are still working through today.
1945–46Nuremberg invents the simultaneous booth
The Nuremberg trials, run in English, French, Russian and German at once, adopt simultaneous interpretation through IBM's headset system under interpreter Léon Dostert — the first large-scale use anywhere. The trials made the four-language courtroom possible and founded the modern conference-interpreting profession, the translator's spoken-word sibling.
1954The Georgetown–IBM experiment
On 7 January 1954 in New York, an IBM 701 translates more than sixty Russian sentences into English using a 250-word vocabulary and six grammar rules. Researchers predict machine translation will be solved within three to five years; the 1966 ALPAC report, finding little progress, cuts US funding for a generation instead.
2016Neural machine translation goes mainstream
Google switches Translate to a neural system in November 2016, cutting errors sharply overnight for major language pairs; the Cologne startup DeepL follows in 2017. Within a few years, machine output becomes the raw material of much commercial translation, and "post-editing" enters the profession's standard vocabulary and price lists.