In 1162 St Thomas Becket was consecrated bishop in Canterbury Cathedral on the Sunday after Whitsun having been ordained priest on the previous day.

He subsequently promoted that Sunday as Trinity Sunday annually ahead of its universal adoption under Pope John XXII in 1334.

Pope John also introduced Corpus Christi on the Thursday after Trinity Sunday.

In 1162 Trinity Sunday and Corpus Christi were already being observed on today’s moveable dates in Liege and Benedictine monasteries including Cluny Abbey.

Becket’s shrine was placed in Canterbury Cathedral‘s Trinity Chapel.

Although Winchester Cathedral is dedicated to the Holy Trinity this only dates from Henry VIII’s reign and is in addition to the older and more popular St Peter and St Paul and St Swithun.