His last will dated May 14 is evidence of a wide circle of gifted friends including Thomas Butler, 6th Earl of Ossory, John Keating, the future Lord Chief Justice of Ireland, and the leading physician Nicholas Henshaw.
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The Viscount Galmoye peers were descended from the 10th Earl of Ormond (see Piers Butler, 3rd Viscount Galmoye).
He had two younger brothers, John Butler, 6th Earl of Ormond, and Thomas Butler, 7th Earl of Ormond, as well as two sisters, Elizabeth Butler, who married John Talbot, 2nd Earl of Shrewsbury, and Anne Butler (d. 4 January 1435), who was contracted to marry Thomas FitzGerald, 7th Earl of Desmond, although the marriage appears not to have taken place.
Joan de Beauchamp (1396- 3 August 1430), married on 28 August 1413 James Butler, 4th Earl of Ormond, son of James Butler, 3rd Earl of Ormond and Anne Welles, by whom she had five children, including Thomas Butler, 7th Earl of Ormond.