Gíolla Íosa Mór Mág Tighearnán
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Giolla Íosa Mór Mag Tighearnán (anglicised 'Big' Gilleese McKiernan) was chief of the McKiernan Clan and Baron or Lord of Tullyhunco barony, County Cavan from c. 1269 until his death in 1279.[1]
Gíolla Íosa became chieftain immediately following the death of Íomhaor Mág Tighearnán, the Second. He resided in the castle of Croaghan of the Cups (Irish: Cruachan O'Cúbhrán), now in the townland of Coolnashinny, which is located beside the modern town of Killeshandra. During Gíolla Íosa's reign, he helped the O'Rourkes capture Cloughoughter Castle from the O'Reillys, although the Sheridan clan recaptured it.[2]