Descendants differ on the middle name of Peter B. Allen - his father's middle name was Buell and most believe the son also carried that name. However one branch of the family believes his middle name to have been Benton. BOTH surnames, Buell and Benton, are in the family lineage.

Peter and Mary had nine children - one is missing from the list below. Their eldest child was a son Augustus A. Allen who was buried in the Old Hon Cemetery in Scott County, Arkansas. Augustus "August" was born 21 May 1841 in Sevier County, Arkansas, died 9 January 1882 in Scott County. He has a military stone for his Civil War service and his memorial page is #60199809.

Peter B. Allen was born in Ontario County, New York - his parents and siblings all removed to Vigo County, Indiana about 1818, settling in what would become Terre Haute. Peter served as Deputy Court Clerk for Vigo County about 1833-34. He married there to Mary Rowena Hoskins, on 28 December 1836. By 1840, they were in the Arkansas Territorial Census in Sevier County - by 1846 they were in Polk County where they lived the rest of their lives.

Peter Allen served as a Representative in the Arkansas Legislature 1860-1862 for the counties of Scott, Polk, Montgomery, and Hot Springs. He was postmaster for a number of years and also served as justice of the peace and county judge.

Peter's Will was dated 9 April 1901 and copied in the Newsletter of the Polk County Genealogy Society. His homestead was divided among his eight heirs (son Augustus had died in 1882).

An obituary appeared even in the Terre Haute newspaper, although much of the article was about his nephew that was still living in Terre Haute:

From the Terre Haute Evening Gazette,
Saturday, 12 Oct 1901, page 1
A TERRE HAUTE PIONEER IS DEAD
Peter B. Allen, Who Came Here in 1818 With His Father, Gen. P. B. Allen.
UNCLE OF CAPT. NAT ALLEN
Lived Here For a Number of Years and Then Moved to Arkansas -- A Pioneer Family.

Captain Nat Allen, of this city, has just received a letter announcing the death of his uncle, Peter B. Allen, son of Gen. Peter B. Allen, a pioneer resident of Terre Haute. He died on the 26th of last month at Cove, Polk county, Arkansas, from geneal debility. He was born in Ontario county, N. Y., Nov. 5, 1811, so that he was almost 90 years old at the time of his death.
The deceased, as stated, was the son of Gen. Peter B. Allen who came to Terre Haute on June 4, 1818. Gen. Allen landed with his wife and family, one of whom was the son just deceased, then only 11 years old, at Old Terre Haute on that date on a boat that floated the Ohio and was pulled up the Wabash to Old Terre Haute. At that time the present city of Terre Haute consisted of only a few houses. It was laid out in 1816.
Gen. Allen took the lumber, out of his boat and made a house out of it that stood for years on the present site of the I. V. Preston farm house north of the county poor house.
The deceased was married at the old house on the Preston place east of Terre Haute on December 26, 1836, to Mary Hoskins, a daughter of Gen. Hoskins, also a pioneer resident of Terre Haute dead many years. He had eight children and there are seven of them still living. Mrs. Allen, his wife, died several years ago in Arkansas.
The deceased when a young man was a clerk in the county clerk's office of Vigo county for a number of years under his brother-in-law Curtis Gilbert, who was county clerk for a long time. Soon after his marriage here in 1836 the deceased moved to Arkansas and has never been back to Terre Haute since. It was thirty years before his relatives knew where he was.
Capt. Nat Allen, of this city, was the son of Ira Allen, who came here his brother, the deceased, on the boat to Old Terre Haute on June 4, 1818, with their father, Gen. Peter B. Allen. Ira Allen was killed in an accident in Clay county in 1869. He was also the father of Ed. Allen, recently deceased, and the grand-father of George M. Allen for many years editor of the Express.
Capt. Nat Allen, of this city, has lived to see all the Allens who came to Old Terre Haute on June 4, 1818 on the board with Gen. Peter B. Allen, and who afterward located in Terre Haute, pass away, the deceased in Arkansas being the last. Captain Nat Allen is almost the last of the Allens and is the oldest of the family tree now living. He will soon be 80 years old, having been born in Terre Haute, June 8, 1822, on south First street opposite the old Ellis Woolen mills.