Blessings for the coming year as we enter a new liturgical season with Twelfth Night and Epiphany looming large. Of all my years of pewsitting, I have never come across this - the Epiphany Proclamation - and I am indebted to Father Michael of Interrupting the Silence for making me aware of this tradition.
This information set me off looking for other mentions of the tradition. So to enlarge the repertoire here are some links worthy of your time:
Ephiphany image from here.