This surname derives either from the Mac Cochlain sept whose territory was the barony of Garrycastle, County Offaly, or from the O'Cochlain sept from County Cork, where their descendants are numerous, usually now prefering the spelling of Coughlan. The maritime county of Cork, in Munster, is bounded by the sea on the south-west, the south and the south-east. To the east it has land boundaries with the counties of Waterford and Tipperary, and to the north with Limerick and to the west with Kerry. Anciently the country formed part of the kingdom of Desmond. After the Anglo-Norman Invasion the whole of the present county, save the City of Cork (which had been founded by the Vikings) and its surroundings, was granted in 1177 by Henry II to Anglo-Norman knights who brought over their followers and established a military colony.
When the sparse Irish population began to increase it became necessary to broaden the base of personal identification by moving from single names to a more definite nomenclature. The prefix MAC was given to the father's christian name, or O to that of a grandfather or even earlier ancestor. At first the coat of arms was a practical matter which served a function on the battlefield and in tournaments. With his helmet covering his face and armour encasing the knight from head to foot, the only means of identification for his followers, was the insignia painted on his shield and embroidered on his surcoat, the draped and flowing garment worn over the armour.
The associated arms are recorded in Sir Bernard Burkes General Armory. Ulster King of Arms in 1884.
Registered to John Coghlan of Kilcolgan, Kings Co. in the year 1654.
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