Wisconsin: American journalist Ron McCrea and Professor William Drennan of the University of Wisconsin have been researching the seven savage killings at Taliesin, the hillside home of Frank Lloyd Wright, in 1914.
Frank Lloyd Wright was born in 1867 in Wisconsin, to a family of Welsh descent. He became America's most famous and influential architect and was a leading figure in world architecture until his death in 1959.
Taliesin the name of a Welsh bard was the name that Wright gave to the house he built in 1911 near his childhood home in the Wisconsin valley where his mother's Lloyd Jones family had lived for generations.
Taliesin was a showpiece of Wright's design principles.
However, it was also the focus of scandal because he built it as the home for himself and the woman for whom he had left his wife and six children, Martha "Mamah" Borthwick.
And three years later, on 15 September, 1914, it became the scene of the biggest single incident of mass-murder in Wisconsin history.
While Wright was away in Chicago, 30 year old servant Julian Carlton bolted the doors and windows of the dining room where Mamah Borthwick, her two children, and six other people were eating, poured buckets of petrol under the doors and torched the building.
He then used an axe to attack those who jumped out of the windows to escape the flames.
Only two people survived and they raised the alarm. Scores of farmers arrived to help. Wright's relative, the Unitarian preacher Jenkin Lloyd Jones, Iowa County Sheriff John T. Williams and Sauk County Undersheriff George Peck set up a posse to hunt for Carleton.
He was quickly found hiding near the burned-out building. He had swallowed acid. He was nearly lynched on the spot, but the sheriff and posse, pursued by three carloads of men with guns, got him to the Dodgeville jail.
He died from starvation seven weeks later, despite medical attention. He made two court appearances but never stood trial, and his motive for the attack was never explained, although there are various theories.
Carlton was from Barbados.