Nest or Nesta or Nestia or Agnes (the last one is the Anglicized version of her Welsh name) Vetch Osbern or FitzOsbern or even FitzRichard (is it any wonder the Welsh are so hard to find in internet searches?) was born about 1079 , the daughter of Osbern FitzRichard and Agnes (Nest), a Welsh princess and daughter of Gruffydd ap Llywelyn and Edith of Mercia.

Osbern was looking to make an advantageous match for his daughter, and he was impressed by the rise of Bernard deNeufmarche, a Norman of rather obscure background but excellent political and administrative skills. deNeufmarche was a powerful Marcher Lord.

The marriage took place sometime before 1099 (probably before 1096), when Nestia would have been a teenager, and Bernard was nearly 50. There are no records of a previous wife or other children for Bernard. Nestia brought with her a dowry of Berrington and Little Hereford. It is impossible to tell how happy the marriage was. They definitely had two, possibly as many as four, children - a daughter Sybil and three sons, Mahel (a.k.a. Michael), and less certainly William and Adam.

The story of Nestia takes a dramatic turn after the death of Bernard around 1125. Middle-aged Nesta apparently took a lover. According to Giraldus Cambrensis (archdeacon of Brecon, a medieval clergyman and chronicler of his times ), Mahel de Neufmarché the son and heir of Bernard had mutilated the paramour of his mother. In vengeance, Princess Nesta, swore to King Henry I that her son was illegitimate. This must have been unheard of for a mother to disgrace herself to take revenge on her son.

Brechnock local history is even more scandalous. It states that Nesta took a lover before Bernard died, and Mahel assaulted the man when he caught his mother and her lover in his father's bed. The shock of the events, and Nesta's claim that Mahel was not his son, killed Bernard.

King Henry was eager to believe Nesta, because this allowed him to bypass law and custom to disinherit Mahel and give the Neufmarche land to his friend, kinsman, and confident Miles (a.k.a. Milo) Fitz Walter - who had married (or would soon marry) Sybil, Bernard's firstborn child and legal heiress.

The story is mentioned in:

"Nest fell in love with a certain knight, with whom she committed adultery. This became known, and her son Mahel assaulted her lover one night when he was returning from his mother. He (Mahel) gave him a severe beating, mutilated him and packed him off in great disgrace. The mother, disturbed by the remarkable uproar which ensued, and greatly grieved in her woman's heart, fled to Henry I, King of the English, and told him that her son Mahel was not Bernard's child, but the offspring of another man with whom she had been in love and with whom she had secret and illicit intercourse. This she maintained rather from malice than because it was true, confirming by oath which she swore in person before the whole court. As a result of this oath, which was really perjury, King Henry, who was swayed more by prejudice than reason, gave Nest's eldest daughter, whom she accepted as Bernard's child, in marriage to a distinguished young knight of his own family, Milo FitzWalter, Constable of Gloucester, adding the lands of Brecknock as a marriage portion.

In an astounding example of what Jeffrey Jerome Cohen calls 'deployment of Welshness', Nest admits not just to one lover but two, and falsely declares her legitimate son a bastard in order to disinherit him."

No mention is made of the younger sons - either they did not exist, died young, or joined the clergy - the only reasonable ways they could be bypassed in favor of a sister.