He was so great a lawyer, that it was impossible to find his equal, he was very wise, and had the gift of foretelling events, he was good at counsel, and of a good disposition, and whatever counsel he gave people was for their best; he was gentle and humane, and got every man out of trouble who came to him in his need.
His wife was called Bergthora; she was the daughter of Skarphethin.

She was a bold-spirited woman who feared nobody, and was rather rough of temper.

They had six children, three daughters and three sons, all of whom will be frequently mentioned in this saga." In the history many instances are given of Nial's skill in giving good advice and his power of seeing events before they happened.

Nial lived in Iceland during most singular times, in which though there were laws provided for every possible case, no man could have redress for any injury unless he took it himself, or his friends took it for him, simply because there were no ministers of justice supported by the State, authorised and empowered to carry the sentence of the law into effect.
For example, if a man were slain, his death would remain unpunished, unless he had a son or a brother, or some other relation to slay the slayer, or to force him to pay "bod," that is, amends in money, to be determined by the position of the man who was slain.

Provided the man who was slain had relations, his death was generally avenged, as it was considered the height of infamy in Iceland to permit one's relations to be murdered, without slaying their murderers, or obtaining bod from them.
The right, however, permitted to relations of taking with their own hands the lives of those who had slain their friends, produced incalculable mischiefs; for if the original slayer had friends, they, in the event of his being slain in retaliation for what he had done, made it a point of honour to avenge his death, so that by the lex talionis feuds were perpetuated.