Robert Dunbar's parents are in question. He was probably not the son of Ninian Dunbar, who had a son Sir Robert Dunbar in Scotland.
Speculation: Robert is definitely not the son of Sir Ninian Dunbar of Grange. Sir Ninian did indeed have a son named Robert, but that Robert went on the become a member of Parliament. Robert never left what is now the UK. While he was arguing in Parliament, Robert & Rose of Hingham were busy building their family in Hingham. Robert of Hingham never left Massachusetts after arriving there in 1650. Obviously they can not be the same man. Robert was a very commmon name in the Dunbar line, particularly in the 16th and 17th centuries.
Robert was a Cromwellian prisoner of war. The name of Lt. Col. Dunbarr [sic] is on a handscript list of prisoners taken at the Battle of Dunbar; no first name is given for any officers; he is listed second after Col. Leslie. In 1659. Robert deposed that he had been a servant of Mr. Joshua Foote when Mr. Foote lived in Boston. He also stated (in 1659) that he was 25 years old.
Rev. Peter Hobart's comment that "the opinion generally prevailed in Hingham that Mr. Dunbar brought money enough with him to begin life without embarrassment, as for years there were but two men in the place who paid a higher tax."
Robert, a Scotchman, and probably the ancestor of all the families who have borne this surname in Plymouth County, became a resident of Hingham shortly after 1650.  Robert Dunbar was probably born about 1630-34 in Scotland. According to tradition, Robert was a native of Morayshire, Scotland.
The christian name of his wife was Rose. She survived him and died 10 Nov 1700. 
Robert died 19 Sept. 1693. In his will, dated at Hingham 13 Sept. 1693, gives "to wife Rose a living in my now dwelling-house, and the use of all the land, which I give to my sons Joseph and Joshua, the whole term of her keeping the name of Dunbar ; and in case of necessity she may sell or let said land for her maintenance." To sons John, Joseph, and Peter, the home land. To son Joshua "the rest of my land as far as the river." Bequeaths to James Dunbar "the son of my son, James, deceased," £10. He further gives to Joseph "enough apples, annually from the tree in my orchard to make two barrells of cyder." To his three daughters, "Mary Dunbar, Sarah Dunbar, and Hannah Dunbar, all my land on the other side of the river, share and share alike, ann my indoor movables after my wife's decease." The inventory of his estate, appraised 28 Sep 1693 included, dwelling-house and land, £130: two oxen, seven swine, two cows, two caves, household goods, etc."
Robert lived on Scotland Street in Hingham.
Previously listed as sources
No explanation of these possible sources provided
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