A short history
An ancient practice, shared across the Mediterranean world.
Letter-number play appears throughout the ancient Mediterranean. Hebrew letters became numerals relatively late, probably on the Greek model. The rabbis used gematria sparingly, as a teaching aid, and medieval mystics developed it much further.
c. 713 BCE
Near East
An Assyrian king builds a wall to the length of his name
Sargon II records that he made the wall of his new capital, Dur-Sharrukin, 16,283 cubits long, “the number of my name.” It is the oldest known case of name-number play, about five centuries before anyone wrote Hebrew letters as numbers.
5th c. BCE
Greco-Roman
Greeks start writing numbers with letters
The Ionic system makes α=1, β=2 … ι=10, ρ=100. Adding up a word's letters gets a name: isopsephy, “equal pebbles.” The word gematria itself is most likely Greek, from geometria or grammateia.
Book of Jeremiah
Jewish
The one cipher actually in Tanach is not numerical
Jeremiah 25:26 and 51:41 write שֵׁשַׁךְ for בָּבֶל (Babylon), and 51:1 writes לֵב קָמָי for כַּשְׂדִּים (Chaldeans). That's atbash, a letter swap. Meanwhile every number in Tanach is spelled out as a word; the text never uses letters as numerals.
79 CE
Greco-Roman
A love note on a wall in Pompeii
Scratched into plaster before Vesuvius buried the town: “I love her whose number is 545.”
φιλω ης αριθμος φμε
c. 66–70 CE
Jewish
Hebrew letters as numbers, on coins
Silver shekels of the Great Revolt against Rome are dated שנת ב, “year 2,” using a letter for the number. The Hebrew letter-numeral system that gematria depends on is a product of the Hellenistic and Roman era, very likely modeled on Greek.
c. 95 CE
Jewish
666
Revelation 13:18 invites the reader to “count the number of the beast.” The standard reading is Nero Caesar spelled in Hebrew letters, נרון קסר = 666. Some manuscripts read 616, which is exactly נרו קסר without the nun.
c. 121 CE
Greco-Roman
A Roman joke about Nero
Suetonius preserves a joke that circulated in Rome: the letters of “Nero” add up to the same as “killed his own mother.” Number wordplay was part of everyday Greco-Roman culture.
c. 200 CE
Jewish
The Mishnah: a garnish of wisdom
Rabbi Eliezer ben Chisma: “Astronomy and gematria are the parparaot of wisdom” (Pirkei Avot 3:18).Parparaot are accompaniments to a meal: valued, but not the main course.
תְּקוּפוֹת וְגִמַּטְרִיָּאוֹת פַּרְפְּרָאוֹת לַחָכְמָה
Talmud
Jewish
Occasional sermons, never law
הַשָּׂטָן = 364, so the Satan has power every day of the year but one, Yom Kippur (Yoma 20a). Abraham's 318 men were really just Eliezer, אֱלִיעֶזֶר = 318 (Nedarim 32a). These support ideas the rabbis already held; halacha is not derived from gematria.
12th c.
Medieval
Ibn Ezra objects
Commenting on those 318 men (Genesis 14:14), Abraham ibn Ezra rejects the Eliezer reading: Scripture, he says, does not speak in gematria.
c. 1200
Medieval
Germany: gematria becomes a system
The Chasidei Ashkenaz, above all Rabbi Elazar of Worms, fill commentaries and prayers with numerical equivalences. Many of the alternate methods (filled-out letter names, kolel adjustments, substitution ciphers) spread in this period.
13th c.
Medieval
Kabbalah: gematria at the center
Abraham Abulafia makes letter permutation and number equivalence the core of a meditative practice. In mystical circles, gematria comes to be seen as a way into hidden layers of Torah.
1994–1999
Modern
The Bible Code, and its debunking
A paper in Statistical Science claims hidden equidistant-letter messages in Genesis. Five years later, McKay, Bar-Natan, Bar-Hillel and Kalai show that the same flexibility in choosing names and spellings finds equally “miraculous” results in War and Peace. The lesson applies to gematria exactly: freedom of choice manufactures significance.
In short: gematria has a long history as interpretive wordplay, adopted by the rabbis as an accompaniment to learning and developed by medieval mystics into a spiritual discipline. It can be a meaningful way to connect and remember ideas. Because every number is shared by so many phrases, though, a match on its own isn't evidence of a hidden link, as the search shows.