Editing Celtic Christianity (section)

==Universal practice==
Connections with the greater [[Greek East and Latin West|Latin West]] brought the nations of Britain and Ireland into closer contact with the orthodoxy of the councils. The customs and traditions particular to Insular Christianity became a matter of dispute, especially the matter of the proper calculation of Easter. In addition to Easter dating, Irish scholars and cleric-scholars in continental Europe found themselves implicated in theological controversies but it is not always possible to distinguish when a controversy was based on matters of substance or on political grounds or xenophobic sentiments.<ref name="flech">{{harvnb|Flechner|Meeder|2016|pp=231–41}}</ref> Synods were held in Ireland, Gaul, and England (e.g. the [[Synod of Whitby]]) at which Irish and British religious rites were rejected but a degree of variation continued in Britain after the Ionan church accepted the Roman date.

The Easter question was settled at various times in different places. The following dates are derived from Haddan and Stubbs: southern Ireland, 626–628; northern Ireland, 692; Northumbria (converted by Irish missions), 664; East Devon and Somerset, the Britons under Wessex, 705; the Picts, 710; Iona, 716–718; Strathclyde, 721; North Wales, 768; South Wales, 777. Cornwall held out the longest of any, perhaps even, in parts, to the time of Bishop Aedwulf of Crediton (909).<ref>A. W. Haddan and W. Stubbs (ed.), ''Councils and Ecclesiastical Documents Relating to Great Britain and Ireland'', 3 vols (Oxford, 1869–78), I, 112-3, Quoted in "The Catholic Encyclopedia".</ref>

A uniquely Irish [[penance|penitential system]] was eventually adopted as a universal practice of the Church by the [[Fourth Lateran Council]] of 1215.