Aghamarta Castle

I'm basically looking for more information on Aghamarta Castle as information is sparse and fragmentary at best.

Aghamarta (Irish: Achadh Mhártain) in the barony of Kerrycurrihy (Ciarraí Cuirche), in the parish of Teampall Bríde (Templebreedy) translates as the plane of Martin. (Bunachar Logainmneacha na hÉireann 2014) Within the grounds of Aghamarta demesne are vestiges of the ancient castle of that same name, also a Norman keep of the Desmonds. It belonged from the middle of the 16th century to John de Wynchedon. (Royal Society of Antiquaries of Ireland 1959) (Butler 1842) (Caulfield 1879) South-west of Monkstown is Ringaskiddy, or the promontory of the Skiddys, a Cork Danish-descended family. Near the village of Ringaskiddy stood the Castle of Miles de Cogan, one of the first of the Normans who settled here. This castle (Barnahely) was knocked down to make room for the (now ruined) mansion known as Castle warren. A couple of miles south of Ringaskiddy runs the owneabue River, on whose southern bank, hidden amongst the trees round Aghamarta House, is the small tower, all that now remains of Aghamarta Castle, which was built by the first Earl of Desmond, and was subsequently held by the Wynchedons or Nugents. Maurice FitzThomas FitzGerald, 1st Earl of Desmond was an Irish nobleman in the Peerage of Ireland, Captain of Desmond Castle in Kinsale, for a short time Lord Justice of Ireland. He led a rebellion against the Crown, and was suspected of aiming to make himself King of Ireland, but he was ultimately restored to favour. In 1345 he presided at an assembly of Anglo-Irish magnates at Callan, Co. Kilkenny, ignored a summons to attend the Irish Parliament and attacked Nenagh. It took two years to crush his rebellion and Maurice FitzThomas FitzGerald only surrendered on a promise that his life would be spared. He was imprisoned and his lands forfeited while he awaited trial. He was allowed to go under guard to England to answer the charges against him and, realizing that Ireland could not be governed without the support of the local Lords and magnates, in 1348 he was released and pardoned in 1349, gaining back his forfeited lands. (Burke 1866) (Cokayne 1912) (Otway-Ruthven 1995) (Otway-Ruthven 1980) (Otway-Ruthven 2008)
Richard Sainthill described Aghamarta as such:

Aughamartyn, now called Aghamarta Castle, held from Lord Haberton by a Mr. Jago, then by Col. Hodder, purchased by Carew Smith O’Grady, brother to the Chief Baron. He told me his title went back to Charles II, who granted it to some person. It must therefore have been a forfeiture in the rebellion of 1641. There is an old story told to me by an old man, who had it from another old man then 105 years old and who remembered the bridge of Aughamartyn being built, and in laying the foundations the crane of the old gallows was removed, where the Nugents hanged anybody who injured them to the value of sixpence. The last of them was Bridget Nugent, a widow woman, who had no law but her own will.