What is the origin of the Good Friday tradition?

As suggested by [this question](https://christianity.stackexchange.com/questions/3310/was-the-last-supper-not-the-passover-meal) and [this answer](https://christianity.stackexchange.com/questions/248/how-long-was-jesus-in-the-tomb/3107#3107) , it seems possible that Jesus actually died on a Wednesday, not on a Friday. In light of these competing theories, what is the origin of the Good Friday tradition?