"Richard de Clare, 2nd Earl of Pembroke (of the first creation), Lord of Leinster, Justiciar of Ireland (1130 – 20 April 1176). Like his father, he was also commonly known by his nickname Strongbow (French: Arc-Fort). He was a Cambro-Norman lord notable for his leading role in the Norman invasion of Ireland."

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Links:

http://www.castlewales.com/strngbow.html

http://en.wikipedia.org/wiki/Richard_de_Clare,_2nd_Earl_of_Pembroke

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=5887495 (which gives slightly different dates)

http://histfam.familysearch.org/getperson.php?personID=I4297&tree=PagetHeraldicBaronag

http://humphrysfamilytree.com/deClare/1st.earl.pembroke.html

http://www.mathematical.com/clarerichard1125.html

http://thepeerage.com/p10466.htm#i104656

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Citations / Sources:

[S11] Alison Weir, Britain's Royal Family: A Complete Genealogy (London, U.K.: The Bodley Head, 1999), page 68. Hereinafter cited as Britain's Royal Family.

[S106] Royal Genealogies Website (ROYAL92.GED), online ftp://ftp.cac.psu.edu/genealogy/public_html/royal/index.html. Hereinafter cited as Royal Genealogies Website.

[S6] G.E. Cokayne; with Vicary Gibbs, H.A. Doubleday, Geoffrey H. White, Duncan Warrand and Lord Howard de Walden, editors, The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, new ed., 13 volumes in 14 (1910-1959; reprint in 6 volumes, Gloucester, U.K.: Alan Sutton Publishing, 2000), volume II, page 387. Hereinafter cited as The Complete Peerage.

[S6] Cokayne, and others, The Complete Peerage, volume X, page 357.

[S18] Matthew H.C.G., editor, Dictionary of National Biography on CD-ROM (Oxford, U.K.: Oxford University Press, 1995), de Clare, Richard. Hereinafter cited as Dictionary of National Biography.

[S130] Wikipedia, online http;//www.wikipedia.org. Hereinafter cited as Wikipedia.

[S2] Paget Heraldic Baronage, Paget, Gerald, (Manuscript, filmed by the Genealogical Society of Utah, 1957), chart no. 130 Clare, FHL microfilm 170063, 2/2.

[S2] Paget Heraldic Baronage, Paget, Gerald, (Manuscript, filmed by the Genealogical Society of Utah, 1957), chart no. 358 Marshall, Earls of Pembroke, FHL microfilm 170066.