I teach fifth-grade Latin, and recently we were discussing the pronunciation of the Latin digraph and diphthong <ae>. One of my bright young scholars asked if the Latin letter was written with “one of those connected a-e thingies.”
My Anglo-Saxonist heart soared. That “connected a-e thingy” is <æ>, a symbol called by the Anglo-Saxons aesc, like an ash tree. With the adoption of the Latin alphabet, <æ> inherited all the rights and responsibilities of ᚫ, a rune of the same name in the Old English fuþorc. It was pronounced [æ]1, like in, well, ‘ash’.
My Latin class and I had to plow ahead with the nominative plural, but in the back of my mind, I kept mulling it over: Where did my beloved aesc come from, and why isn’t it all over the Classic Latin texts I read?
As with so many questions linguistic, the answer lies in human laziness. Since man started putting pen to paper (stylus to papyrus, wax, clay, &c.2), we’ve been conjoining letters to cut corners and save time and space. Cursive is one thing, but typographic ligatures are little clumps of two or three letters written as a single symbol. An example of a well-known ligature that grew up to be a letter in its own right is <w>, which as the name implies, began life as a double <u>.
There are copious examples of ligatures dating all the way back to Sumerian, but we’re investigating <æ>, and for that we have to look to medieval scribes. It’s as simple as you might imagine: Whether for speed or aesthetics, medieval scribes took <a> and <e> and wrote them as one. In Latin, it made no nevermind whether you used the ligature or wrote <ae>.3 In fact, as Latin pronunciation changed throughout the Middle Ages, the spelling was sometimes reduced to merely <e>. (Thus, we modernly tend to write “medieval” rather than “mediæval”.)
Old English wasn’t the only language to promote this particular ligature to a letter. Today, it can still be found in languages like Icelandic and Norwegian.
In Modern English, aesc has been relegated to the status of relic. It gets trotted out when calligraphers and designers want to make something look fancy or antiquated, but otherwise, it’s just some letter that we used to know.4
1 It becomes fairly obvious where linguists found the symbol to represent this sound in IPA.
2 I would just like to share that the ampersand or “and sign” (&) began life as a ligature of <et>. “Et” is “and” in Latin. I can’t even.
3 As far as Classical Latin goes, the Romans themselves and modern editors use distinct <ae> much more often than not.
4 Alas for me! I suppose I’ll just have to stick to doodling aesc in various margins.