History of Birr, Chapter VII.

In the Summer of 1798, Charles Slavin was tried in the old Market-house of Birr, on a charge of having poisoned one Jackson, his master. Both were from Grange, in the neighborhood of Birr. Slavin, having been found guilty, was hanged, or rather strangled, at the old gaol of Birr, his executioner being a person named Lindsay. The prisoner was first suspended on a platform between two cars, and was afterwards drawn up from the ground by a rope from one of the windows, while still endeavouring to cling to the wall with his hands.

The Early History of the Town of Birr, or Parsonstown...
by the Late Thomas Lalor Cooke. Robertson & Co., Dublin, 1875.