Robert Bruce, 3rd Baron of Clackmannan
Sir Robert Bruce, 3rd Baron of Clackmannan & Rate (died c. 1405) was the son of Sir Robert Bruce, 2nd Baron of Clackmannan & Rate and Isabel Stewart of Fife.
Robert Bruce was born into the Scottish aristocracy in Clackmannan, Scotland.
He married the daughter of John Scrimgeour of Dudhope, by whom he had at least three children:
Burnett M. Chiperfield
Burnett Mitchell Chiperfield( June 14, 1870 – June 24, 1940) was a U.S. Representative from Illinois, father of Robert Bruce Chiperfield.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
Isabella of Mar
Isabella of Mar( fl. c. 1277 – 12 December 1296) was the first wife of Robert Bruce VII, Earl of Carrick.
Isabella died before her husband was crowned( as Robert I) King of Scotland.
She and her husband were the grandparents of Robert II, King of Scotland.
Isabella was the daughter of Domhnall I, Earl of Mar( died 1297 × 1302) and Elena, daughter of Llywelyn the Great( died 1282).
Isabella's father was evidently an adherent of Robert Bruce V, Lord of Annandale( died 1295), a man who staked a claim to the Scottish throne.
The close relationship between the Domhnall's family and the Bruces is evidenced by two marriages.
One was that between Isabella and Robert Bruce VII, Earl of Carrick( died 1329), a grandson of Robert Bruce V. Domhnall's son and comital successor, Gartnait( died c.1302), married a sister of Robert Bruce VII.
The marriage of Robert Bruce VII and Isabella probably took place in the 1290s.
The union produced a single child, a daughter named Marjorie( died 1316), who was born in about 1296.
Six years after Isabella's death, Robert Bruce VII married his second wife, Elizabeth de Burgh( died 1327).
Robert and Isabella's daughter, Marjorie, married Walter Stewart, Steward of Scotland, and their son eventually reigned as Robert II, King of Scotland( died 1390).
Poul Abraham Lehn
Poul Abraham Lehn( 9 October 1732 – 24 October 1804), Baron of Lehn and Baron of Guldborgland, was a feudal baron of the Danish and Norwegian nobility and one of the greatest landowners of his time in Denmark.
Thomas Bruce, 1st Baron of Clackmannan
Sir Thomas Bruce, 1st( feudal) Baron of Clackmannan( born 1313, died before 1358) was the first Baron of Clackmannan.
King David II of Scotland, near the end of his life, appears to have regarded Thomas as the next most senior member of the Bruce family, meaning that he was believed to be a male line descendant of Robert de Brus, 1st Lord of Annandale, but his exact relationship to the royal Bruces is unclear.
It has been suggested that he was the son of an illegitimate son of Robert the Bruce or Edward Bruce, but there is no clear evidence for this; he may have belonged to a more distant branch of the family.
Thomas was granted land in Clackmannan by King Robert II of Scotland after organising a revolt against the English in 1334.
He married Marjorie Charteris of Stenhouse and it is from this line which most Bruces descend, including the current Chief of Clan Bruce, Andrew Bruce, 11th Earl of Elgin.
Thomas and Marjorie's children included Robert Bruce, 2nd Baron of Clackmannan.
James Bruce (Chief Justice)
James Bruce( 1691–1749) was the Chief Justice of Barbados and the son of Alexander Bruce of Gartlet.
Through the paternal line James Bruce was a direct descendant of Thomas Bruce 1st Baron of Clackmannan.
Robert Bruce (merchant adventurer)
Robert Bruce of Clackmannan was the son of Sir James Bruce and a direct descendant of Sir Thomas Bruce, 1st Baron of Clackmannan.
Robert Bruce was a successful trader and he immigrated to the British Gold Coast in 1745.
Bruce resided in the Ga city of Jamestown, Ghana.
Martin O'Neill, Baron O'Neill of Clackmannan
Martin John O' Neill, Baron O'Neill of Clackmannan( born 6 January 1945) is a Scottish politician.
Robert Bruce, 2nd Baron of Clackmannan
Sir Robert Bruce, 2nd Baron of Clackmannan & Rate (died 23 July 1403) was the son of
Sir Thomas Bruce 1st Baron of Clackmannan and Marjorie Charteris of Stenhouse.

Question: What is the date of death of Robert Bruce, 3Rd Baron Of Clackmannan's father?