Who coined the phrase it's all Greek to me?

Answer 1

If you are not familiar with the Greek spoken language then you will find it is not an easy language to understand, and the Greek written language is also very difficult because the English alphabet is not used, so when someone says 'sounds like Greek to me' they are actually saying they don't understand you.

* In Greece, its ''Its all Chinese to me''. :)

Answer 2

Shakespeare used it in Julius Caesar, but I can't vouch for that being it's earliest use.

Answer 3

Something that is all Greek to you is something that is incomprehensible, as if it were in a foreign language.