The Kelly clan had an Exodus from their native lands in the north to the lands of Hy Many due to the Danish incursion in the north. Upon reaching the region the locals, the Fir Bolgs, had begun to prepare an attack. A local priest working with the locals, named Grellan, whom studied under St Patrick, heard about the impending attack and worked to bring about a peace between the two sides.
The Kelly clan, which incidentally did not use Kelly as a hereditary name yet, and the Fir Bolgs exchanged hostages. Cian, of the Fir Bolgs, sent some of his people to live with the Kelly Clan and in return Main More of the Kelly clan sent one of his sons and some of his people to live among the Fir Bolgs.
Main More's son went to live with the Law Bringer of the Fir Bolgs and his wife. They fell in love... thus angering the Law Bringer who convinved Cian to kill the Kelly's living amongst them. Cian killed them and then realizing his mistake sent messengers to Main More and invited him and the rest of the clan chieftains to a party and that they should leave their weapons home.
The night of the party arrived and not knowing the ambush that lie ahead Main More and his chieftains headed to the Fir Bolgs unarmed.
The Fir Bolgs awaited in a marsh along the path.
Grellan, the priest, found out about the impending ambush and stepped in front of his church and called upon the Lord and the ground beneath the Fir Bolgs became a quagmire and they were sucked into the ground.
From this point on Grellan became the Patron Saint of Clan Kelly.
What exactly is a Patron Saint? What does that mean?
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