[3] On September 9, 1679, St. John was horse riding on his estate of Drumlyn Hill, near Knockbridge, accompanied by a manservant and Reverend Power, the Vicar of Tandragee.
[2] In response to the assassination of Henry St John, a proclamation was released by King Charles' Viceroy, the Duke of Ormond.
He mandated that the actions of the Tories would be exacted upon the "wives, fathers, mothers, brothers, and sisters of such of them as shall be out on their keeping, that is not amenable to law and committing them to close prison, until such outlaws shall be either killed or taken" Consequently, this wave of persecution led to a significant number of Catholic refugees seeking safety in County Donegal.
[1] According to local oral tradition, when the vault was opened for Henry St. John's burial, his daughter's body was found outside her coffin at the entrance.
His great uncle was Sir Oliver St John, 1st Viscount Grandison, who was the Lord Deputy of Ireland.