Not to be (but is) confused with his namesake Robert Constable of Nuneaton and Flamborough, esq, the bigamist. This profile was the soldier, the knight, and the MP. The bigamist appears to have been none of those things.
This may well be the Robert Constable knighted by Thomas Radcliffe, 3rd Earl of Sussex, at Berwick, May 11th, 1570. The description of the Arms of the individual are the same in the Nottingham Visitation pedigree, as in Metcalfe's Book of Knights p.125. This Robert's cousin Sir Thomas Manners was knighted at the same ceremony. The HoP reference equivocates over who the correct Robert Constable might be.
It may be possible to confirm family relationships with Robert by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
However, there are no known yDNA test-takers in his direct paternal line.
Mitochondrial DNA test-takers in the direct maternal line: