John Salusbury, of Lleweny

Katheryn of Berain (Welsh: Catrin o Ferain) (born 1540 or 1541; died 27 August 1591), sometimes called Mam Cymru ("mother of Wales"), was a Welsh noblewoman noted for her four marriages and her extensive network of descendants and relations.

Katheryn was the heiress to the Berain and Penymynydd estates in Denbighshire and Anglesey. She is sometimes referred to as Katheryn Tudor, her father being Tudor ap Robert Vychan and her mother Jane Velville. Her maternal grandfather Sir Roland de Velville (1474 - 25 June 1535) was thought to be an illegitimate son of King Henry VII of England by "a Breton lady".[who?]

Katheryn's first husband was John Salusbury (son of Sir John Salusbury, died 1578) of the prestigious Salusbury Family of Lleweni, Denbigh, by whom she had two sons