Edmund McMorrishe

Dominick Browne, seventh in descent from this Aylmer, married, about the year 1565, Mary, daughter and heiress of Maurice Prendergast, of Castle MacGarrett, county Mayo, and so these Mayo estates came into this Browne family. (The Spectator: Volume 39 - Page 577. 1866))
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Castle Mac Garrett Castle Mac Garrett Castle Mac Garrett, Claremorris, co Mayo (BROWNE, sub ORANMORE AND BROWNE, B/PB). ... of the Prendergasts, passed to the Brownes with the marriage of Geoffrey Browne and Man Prendergast in late C16. (Burke's Guide to Country Houses: Bence-Jones, M. Ireland Mark Bence-Jones - 1978.)
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From Gerald, his youngest son, descended the Prendergasts of Hayo, whose Irish title of MacMaurice gave name to the ... Macgarret branch, whilst his eldest son, Philip de Prendeboast. was summoned as a baron in 1206, 1207, and 1221. (General and heraldic dictionary of the peerage and baronetage of ... 1914.)
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"Castle MacGarrett, which in English means Castle Fitzgerald, was the property of the Fitzgeralds or Prendergasts (as they were variously called), Lords of the Barony of Claremorris, and came into the Browne family by the marriage, in 1564, of Dominick Browne, of Carra Browne Castle, to Mary, daughter of Maurice Prendergast.

In 1694, Geoffrey Browne left the old Castle, which was getting unsafe to live in, and built a house in another part of the place, where the family resided till it was burnt in 1811?
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Castlemacgarrett became unsafe, so Geoffrey Browne and his wife Mary Prendergast built a new castle in 1694.
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In the List of castles of 1574 Richard MacMorris is shown as at Castle MacGarrett and Walter MacMorris at Bri. They were no doubt opposed to annexation and became impoverished by the 15 years struggle to prevent it. The signing of the Composition was their death knell as Anglo-Irish baronial chiefs. The last of them appears to have been Mary Prendergast (heiress of Castle MacGarrett) who married, Geoffrey Brown son of Dominick Browne of Carrabrowne and Barna. This Dominick was Mayor of Galway in 1575. (Irish pedigrees: or, The origin and stem of the Irish nation: Volume 2 John O'Hart - 1976.) ... chief of his name ; Davy MacMorrish, of Castlemacgarrett, gent. ; Walter MacEriderry, of Castlcreagh. gent; ... mentions "MacJordan," as of the English sirname Dexter; "MacCostello," aa Navgle ; " MacMorris," as Prendcrgast ; &c. ...