Archer Allen Phlegar was born at Christiansburg, Virginia.
Phlegar, Archer A. was born on February 22, 1846 in Christiansburg, Virginia, United States. Son of Eli and Ann C. (Trigg) Phlegar.
He attended a male academy in Montgomery County and later entered Washington College.
He joined the Confederate Army as a private and rose to lieutenant. When the war was over, he worked on a farm while also studying law and, in 1869, was admitted to the bar. In 1870, he was appointed Commonwealth’s Attorney for Montgomery County and remained there until he was elected to the Virginia State Senate in 1877.
He was elected to the Supreme Court of Appeals in October 1900, and served on that court until February 22, 1901, when he was not re-elected. In 1903, he was again elected to the Virginia State Senate. Phlegar was president of the Virginia Bar Association from 1905 to 1906.