Who was the father of Nudd (Nodens), and who was his wife? (His son was Gwynn ap Nudd.)

Beli Mawr, an ancestor deity in Welsh mythology is the father of Nudd. His wife is Dana (in Irish mythology) or Don (her British incarnation).

https://en.wikipedia.org/wiki/Beli_Mawr
https://en.wikipedia.org/wiki/Nudd
http://albionssacredheritage.blogspot.com/2008/10/beli-mawr.html
http://books.google.com/books?id=MV25OktTqLIC&pg=PA67

Nudd is known by many names, including Nodens, Lludd Llaw Ereint and many others. As Nodons this deity is known from several sites in the United Kingdom, the most impressive of which is the Lydney Park temple complex, the Templum Marti Nodentis (Temple of Mars Nodens).

celtnet.org.uk/gods_n/nudd.html no lo ger exists

Nodens - later known in Wales as Nudd or Lludd Llaw Ereint (the Silver-Handed) and in Ireland as Nuadu - was the Celtic God of Healing, and the son of Belenos, the Sun God, and Anu, his wife.

http://www.earlybritishkingdoms.com/bios/lludd.html

Beli Mawr was his father.

In Welsh myth, he was called either Nudd Llaw Ereint or Lludd Llaw Ereint, "Lludd Silver Hand".

Lludd Llaw Eraint -- Lludd Llaw Eraint, "Lludd of the Silver Hand", son of Beli Mawr, is a legendary hero from Welsh mythology. Beli Mawr (Beli the Great) was a Welsh ancestor deity. ... Welsh mythology, the remnants of the mythology of the pre-Christian Britons, has come down to us in much altered form in medieval Welsh manuscripts such as the Red Book of Hergest, the White Book of Rhydderch, the Book of Aneirin and the Book of Taliesin. ...

http://www.nationmaster.com/encyclopedia/Lludd-Llaw-Eraint

http://www.timelessmyths.com/celtic/welsh.html#Gwynn