Two related petitions from J.F. Cosnahan to the Duke of Atholl seeking intercession with the Prince Regent for remission of transportation sentence imposed on Manxman John Bean Hannay, convicted under Slave Trade Abolition Acts. Provides biographical detail on Hannay's circumstances and family hardship, including the recent death of his brother Alexander, master of the Horatio. Post-Revestment document illustrating Manx social connections and the Duke's residual influence.