In the year 678, Hertford was the venue for the first General Synod of England, organised by Archbishop Theodore of Canterbury. The Synod united the churches of the six English kingdoms for the first time and established links with Rome that survived until the time of Henry VIII. It was attended by bishops Bisi, Putta, Eleutherius, Winfred and Wilfred (who came all the way from Northumbria). They declared divorce illegal and devised a preposterous method for determining the date of Easter, which we still use (it’s the first Sunday after the first Full Moon after March 21st). Yes…Hertford is responsible for Easter changing its date every year.