William Portman was an Irish Anglican clergyman."Prelude to Restoration in Ireland: The End of the Commonwealth, 1659–1660" Clarke, A p 28: Cambridge, CUP, 2004
Portman was a Prebendary of AchonryFasti Ecclesiae Hibernicae: The succession of the prelates Volume 4" Cotton, H. pp170/1 Dublin, Hodges & Smith, 1848–1878 and Archdeacon of Elphin from 1661 until 1665.Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986). Handbook of British Chronology (3rd, reprinted 2003 ed.). Cambridge: Cambridge University Press. .
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