1861, MAC CARTHY, D. (Glas/Green in Irish), Hants, Mac Carthy, D.,Glencurrah (Skibbereen) MacCarthy Glas/Duna. As patrilineal descendants of the 4th Prince, but not the 5th Prince, the MacCarthys of Dunmanway, belonging to the MacCarthy Glas. Subscribers to Rev. Gibson History of Cork
MAC CARTHY, D. (Glas), Hants, Mac Carthy, D., Glencurrah (Skibbereen)
From a Copy at the University of Southern California digitized by Google.
Click to access The%20history%20of%20the%20county%20and%20city%20of%20Cork%20Vol2%20(1861).pdf
MacCarthy Glas/Duna[edit]
As patrilineal descendants of the 4th Prince, but not the 5th Prince, the MacCarthys of Dunmanway, belonging to the MacCarthy Glas[9][10][11] and MacCarthy Duna[12][13] septs, are not technically MacCarthys Reagh. However, most historians and genealogists refer to all descendants of Donal Gott as MacCarthys Reagh, and it is the case that, should the “senior line”, descendants of the 5th Prince, fail, then the MacCarthys of Dunmanway would become the “new” Princes of Carbery.
- Teige-an-Fhorsa MacCarthy, Lord of Glean-na-Chroim
- Teige-an-Duna MacCarthy, Lord of Glean-na-Chroim – ancestor of several surviving septs, he died at the house of Timothy O’Donovan, Magistrate, O’Donovan’s Cove, Durrus c 1830.
https://en.wikipedia.org/wiki/MacCarthy_Reagh
West Cork History 
I think Tadhg an Duna was associated with An Tochar castle.
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