what kind of connection did the first aforementioned place, where he was the king from 1649, have with the celtics?
The migrations of the Celts has become one of the more enduring themes of archaeological and linguistic studies.
Ireland
with the migrations of the Celts being one of the more enduring themes of archaeological and linguistic studies. 
when did the great plague of london start and end Started in 1665 and ended in 1666 what were the death tolls? Estimated 100,000 people were any preventions taken for it? Quarantining (isolation) of ships had been used during previous outbreaks and was again introduced for ships coming to London where did the outbreak happen in the city? City of London was there an exodus from london during the plague? The rich ran away including the king who was the king at that time? Charles II was he exiled too? Yes why was he exiled? Due to the plague what was his relationship with the parliament? The Cavalier Parliament was alienated by the king's wars and religious policies when did he become a king? He was King of Scotland from 1649, and King of England, Scotland and Ireland from the 1660 when did he die? 6 February 1685 what was the cause of death? Modern analysis says he died of uraemia, kidney dysfunction. However, some say it could be mercuric poisoning.
wiki:1210014
Ireland [SEP] Emergence of Celtic Ireland
How and when the island became Celtic has been debated for close to a century, with the migrations of the Celts being one of the more enduring themes of archaeological and linguistic studies. The most recent genetic research strongly associates the spread of Indo-European languages (including Celtic) through Western Europe with a people bringing a composite Beaker culture, with its arrival in Britain and Ireland dated to around the middle of the third millennium BC. According to John T. Koch and others, Ireland in the Late Bronze Age was part of a maritime trading-network culture called the Atlantic Bronze Age that also included Britain, western France and Iberia, and that this is where Celtic languages developed.