Has Talbeah's dynasty changed? Have large cities developed besides Peace Town? Are the Measctha still considered a distinct group, and are they considered to include mixed-race people from New England? Any heresies afoot?
The current ruling house (in 1400) is still the Hreinings, or House of Hrein. By this point, the Hreinings still sit on the thrones of Svea, Norvegr, and Danmork, as well as Setraland. The overlordship of Ireland ended in the 12th century at the hands of Naisi Mac Scalaidhe, who restored the office of High King, and the two Anglish realms were united by Wolnoth Ordricsson, who chased away the Hreining lords there in 1312.
The large cities of Setraland in 1400 no longer includes Frithrborg (Peace Town), as climate and political changes have made the city less appealing for the monarchs. Instead, population has shifted towards the Continent, with Dun Cormac (OTL Montreal) now acting as the political capital. Frithrborg remains the spiritual head of Christianity in Talbeah, however. In addition to Dun Cormac, Fhearga (OTL Quebec City), Graí (OTL Toronto), Thvait (OTL Boston), Bolverkstead (in OTL Maine), and Breithr (OTL Cleveland) are major settlements in 1400.
Maesctha are the vast majority of Christians in the New World, and the majority of the population of Setraland by a large margin. Almost all would identify themselves with the Fanaithe-Irish, and would be treated as indistinguishable from them. A few clans of “true Measctha”, descendants of the Measchta Ethnarchies driven off of the Island of the Blessed by Arvid the Far-Seeker, maintain an existence at the frontiers, where they continue some of the ancient traditions of the Skin People. Most Measctha are not descended from them anymore, as the term applies to those whose ancestors were in OTL New England or were Afonbreni.
Goidellicism, which is basically a continuation of sixth century Celtic Christianity, continues to plague Catholic leadership in 1400. Fainaithe towns across the frontiers tend towards Goidellicism, mostly tolerated by the marchawc lords of that region. A more minor heresy (at least in Talbeah) is Cinguettism. Cinguettists believe that the Church has been corrupted in its mission to save souls, more focused on gaining secular power and influence. Cinguettism is more common in Europe, though even Talbeahan priests have to fight those who curse the Saints and spit on the Eucharist.