The Rt Revd Richard Chartres, Bishop of the Anglican Diocese of London, announced a year-long series of events to commemorate what he termed "the quattordecimcentennial year" of the diocese. I think you get to be a bishop by knowing/using words like that.

If you don't mind a little swapping from one branch to another. The Anglo-Saxon Chronicles says, for 604 AD:

A.D. 604. This year Augustine consecrated two bishops, Mellitus and Justus. Mellitus he sent to preach baptism to the East-Saxons. Their king was called Seabert, the son of Ricola, Ethelbert's sister, whom Ethelbert placed there as king.
Ethelbert also gave Mellitus the bishopric of London; and to Justus he gave the bishopric of Rochester, which is twenty-four miles from Canterbury

St Mellitus, third Archbishop of Canterbury, was sent to England in AD 601 by Pope Gregory in response to an appeal from St Augustine of Canterbury for new missionaries. He was chosen by Augustine to be Bishop of the See of London in AD 604, and the Church of St Paul was founded as its Cathedral. Upon the death of St Laurentius, second Archbishop of Canterbury, in AD 619, St Mellitus succeeded to the Archbishopric until he died in AD 624.

So, you're all agreed then? Don't think being a priest in England in 604 would have been any sinecure. Or 1604, either, with young James I/IV toying with Catholicism. Or, come to think of it, 2004 either!

Only another century until the sesquimillennial. Mark your calendars.

another century

Assuming you don't claim the clock was reset by randy Hal.