Should be "how far back in time can you read English?" The language itself is what is spoken and the writing, while obviously related, is its own issue. Spelling is conventional and spelling and alphabet changes don't necessarily correspond to anything meaningful in the spoken language; meanwhile there can be large changes in pronunciation and comprehensibility that are masked by an orthography that doesn't reflect them.

Indeed, I remember being in Oxford in the 90s and an older man approached me and spoke to me in English and I couldn’t understand a word he said. My ex-wife, who’s an ESL speaker who speaks fluently and without an accent has trouble with English accents in general. Similarly, in Spanish, I find it’s generally easier for me to understand Spanish speakers than Mexican speakers even though I learned Mexican Spanish in school and it’s been my primary exposure to the language. Likewise, I generally have an easier time understanding South American speakers than Caribbean speakers and both sound little like Mexican Spanish. (The Spanish I understand most easily is the heavily accented Spanish of non-native Spanish speakers.)

Accents have diverged a lot over time and as I recall, American English (particularly the mid-Atlantic seaboard variety) is closer to what Shakespeare and his cohort spoke than the standard BBC accent employed in most contemporary Shakespeare productions).

I live in London, I can drive a little over an hour from where I live and hardly understand the people working at the petrol station. A few more hours and they start to speak French.

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I have had to interpret between an Ulsterman and a South African, who were both speaking English. I think those accents have vowel shifted in opposite directions.

I was also taught a bit of Chaucer (died 1400) in English at school. Although not any of the naughty bits.

Having interpreted for a guy speaking with a broad Glaswegian accent on the east coast main line, I can totally believe this.

> older man approached me and spoke to me in English and I couldn’t understand a word he said

like this https://www.youtube.com/watch?v=Hs-rgvkRfwc ?

I was expecting the hooligans from Eurotrip.

You can try this video to see how far back you can understand spoken English: https://www.youtube.com/watch?v=842OX2_vCic

> Spelling is conventional and spelling and alphabet changes don't necessarily correspond to anything meaningful in the spoken language

On the contrary, spelling is highly idiosyncratic until the 18th century, and until then it was tightly correlated to the sounds of spoken language. Shakespeare didn't even HIMSELF have one way of spelling his own last name. That's how non-conventional spelling was until pretty recently.

You can even see it in these examples, words like "maiſter" in IIRC the 1300s example. Which becomes "master" later in English, but remains Mäster in Frisian (the closest Germanic language to English) and is also mäster in Swedish.

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Languages can change in many different ways. Pronunciation changes impede you a lot more the first time you meet someone with a different pronunciation than they do as you interact over time. Grammatical changes are trickier.

Yeah it’s really just the glyphs that are changing here, and occasionally the spelling, otherwise the words themselves are still fairly recognizable if you’re well-read.

there'd be a discontinuity around 1066 since Normans brought over Latin-derived vocabulary aplenty, and overlayed germanic vocabulary. it's super evident if you learn Swedish (for example...very related to pre-1066 English) and have learned Latin (or French), while speaking English.

Yeah. Try comparing texts written in Old English and Old Norse. It's basically the same language. (I'm not surprised at all that Beowulf takes place in Scandinavia.)

But I think they would both be easier to decipher for someone speaking Swedish than English.