Iorwerth Vychan ap Iorwerth Gam ap Owain
- Marriage (1): Katherine verch Gruffydd ap Llywelyn 
 
 
   Another name for Iorwerth was Ierworth Vychan ap Ierworth Hen.  
  Research Notes:  
Source: A Genealogical and Heraldic Dictionary of the Landed Gentry of Great Britain & Ireland" by John Burke & John Bernard Burke, vol. I (London, 1847), p. 506
  Source: Collections Historical & Archaeological Relating to Montgomeryshire, and its Borders, Vol. XIII. (London, 1880), "The Tanat Pedigree", p. 122 - "Ierworth Vychan ap Ierworth Hen. (The like.) = Katherine, dau. of Griffith ap Llewelyn Ierworth. (The like.)"
  
 
Iorwerth married Katherine verch Gruffydd ap Llywelyn, daughter of Gruffydd ap Llywelyn and Senena verch Caradoc.  
 
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