 Although the first conversion of a Northumbrian king, that of Edwin in 627, was effected by clergy from the Gregorian Mission to Kent, it was the Celtic Christianity of Iona that was initially more influential in Northumbria, founding Lindisfarne on the eastern coast as a satellite in 635.However Northumbria remained in direct contact with Rome and other important monastic centres were founded by Wilfrid and Benedict Biscop who looked to Rome, and at the Synod of Whitby it was the Roman practices that were upheld, while the Iona contingent walked out, not adopting the Roman Easter dating until 715.What had finally settled into a broad consensus as to the origins of the style may be disturbed by the continuing assessment of the large numbers of decorated metalwork finds in the Staffordshire Hoard, found in 2009, and to a lesser extent the Prittlewell princely burial from Essex, found in 2003.