Good to see the Forum has come to life again. I have found a Thomas Halpin
or Halfpenny of Dublin, an 'expert in informations', who was attached to Dublin police. Halpin was used by Major Henry Charles Sirr, chief of Police in an unsuccessful plot to incriminate the Egan brothers. From Nick Reddan Extracts, Part 24
There were two Catholic distillers, Daniel and Stephen Egan at Roscrea, Tipperary. The Rev. Mr.Hamilton, J.P. fabricated a plot, claiming that the Egan brothers were planning to murder the Protestants of the neighbourhood. He enlisted the aid of a groom or stableman named Dyer, and an assistant brought from Dublin, a ‘dexterous practitioner in informations’, named Halfpenny, alias Halpin. He was then in the police, an attache of Major Sirr's office. He had,in 1798, displayed great zeal as an informer.
When Halpin arrived at Roscrea,on the 28th of December 1815, he helped Rev. Hamilton and his wife to dress up a straw figure in a suit of Mr. Hamilton's and sat this figure at a table in Mr.Hamilton's house, its back towards the window.
Halpin was given a pistol by the reverend,and later,with Dyer, fired through the window at the stuffed figure, which was hit in the back.
The Egans were arrested and brought to trial, but the jury soon realized that
the prosecution was a farce, and promptly acquitted the prisoners.
Dyer was indicted for wilful and corrupt perjury. But the grand jury, thinking perhaps that he might be useful in the future, freed him.
From ‘85 Years of Irish History 1800-1885’ by William Joseph O’Neill Daunt
Thomas Halpin, the 1798 insurgent, a close associate of Michael Dwyer, eventually turned informer to save his own life. From ‘goireland.com’ & other sources.
Anne Devlin’s father is in jail, charged with being an insurgent. At his trial in 1803, he is freed after police informer Tom Halpin is discredited. From film ‘Anne Devlin’ 1984.
In 1804 Emmet sent his deputy James Hope to the Wicklow mountains to meet Michael Dwyer, leader of the Wicklow rebels. Shortly afterwards, a spy named Halpin appeared in Wicklow in the neighbourhood of Emall (Innall). Dwyer got notice and commenced a pursuit, until, in sight of Dublin, he learnt that Halpin was too far ahead. From ‘Life & Times of Robert Emmet’ by R. R. Madden.
Ken Cooke