Lambert (alive about 700 AD) was the father of a Frankish noble named Robert, who was described in 741 as a "count or duke" in the neighbouring Hesbaye and Maasau regions in what is now northeastern Belgium. No other record about this Lambert exists.

Lambert's own life details and family remains unknown, although it has been proposed based on the use of the names Robert and Lambert that he was the son or paternal grandson of Robert II (Chrodobert II), Lord Chancellor of Francia, and a close relative of his contemporary and namesake, Saint Lambert of Maastricht.^[1]

Lambert had one child:

• Robert, count or duke in Hesbaye and Maasau

Another child has also been proposed, although this is disputed.^{[citation needed]}

• Rotrude, married Charles Martel. Grandmother of Charlemagne.

• Bouchard, Constance Brittain (2015). Rewriting Saints and Ancestors: Memory and Forgetting in France, 500-1200. University of Pennsylvania Press. ISBN 9780812290080.
• The Henry Project - Landrada https://fasg.org/projects/henryproject/data/landr000.htm
• Stewart Baldwin, FASG, Todd A. Farmerie, Peter Stewart (2001), The Henry Project The Ancestors of King Henry II of England: An experiment in a cooperative online database for scholarly medieval genealogy https://fasg.org/projects/henryproject/