Once he was back in office, Osborne's insistence on pursuing his own independent policy quickly angered the new government. William III and his advisers had resolved on a policy of conciliation towards their former enemies in Ireland, especially those who were
Protestants, as long as they would pledge their loyalty to William for the future. In open defiance of this policy and without instructions from the Lord Lieutenant of Ireland and without consulting the Attorney General, Osborne began proceedings for
treason against all landowners, even Protestants, who had been loyal to James II. Outraged pleas from those thus accused were addressed to the London government, backed by petitions from men of influence like
William King, the
Bishop of Derry and future
Archbishop of Dublin, who wrote that Osborne's conduct had "startled the whole Kingdom". The result of this controversy was a stern letter from the
Secretary of State,
the Earl of Nottingham, to the
Lord Lieutenant of Ireland,
Henry Sydney, informing him of the King's strong personal disapproval of Osborne's proceedings, which had given "great fear" to precisely those Irish subjects whom the King was seeking to win over to his side. The High Court judges were ordered to immediately halt all treason trials and to reassure those charged with treason that no harm would come to them, so long as they remained on good behaviour. The letter ended with a severe reprimand to Osborne for his "indiscreet zeal". , Osborne's superior, with whom he quarrelled bitterly, leading eventually to his dismissal from office. Untroubled by official censure, Osborne was apparently prepared to act in open defiance of the royal commands. As late as 1692, Protestant landowners were still complaining of being harassed by him. His enemies argued that his real motive was not loyalty but greed. He was prepared to recommend
pardons for those convicted of treason, but expected in return to receive the fees payable for the
fiants necessary to obtain them. He gave even greater offence to the Crown by his conduct in the
Irish House of Commons, to which he had been elected as member for
County Meath in 1692. This Parliament had been called partly to ratify the
Treaty of Limerick, which gave favourable terms to the defeated Roman Catholic supporters of James II. Osborne, who sat on every important committee, led the opposition to these terms as being excessively generous to the Catholics. Such was his powerful opposition that Parliament had to be
prorogued in November 1692, after a session of only four weeks. As a result, the relevant articles of the treaty never took effect. Sydney referred to Osborne and his allies in the Commons as "great enemies of the King". ==Dismissal from office and death==