Sir Robert Adair (I believe he married Jean Edmonstone) is mentioned in "Calendar of State Papers - Ireland 1633-1647"page 241. 10th June 1640 Rawdon to Lord Conway and Killultagh. "I suggested to Sir George Radcliffe, who is now leaving here for England, that in place of five thousand pounts of your arrears, you should have the Adare estate at and near Ballymanagh (Ballymena) in Antrim.Mr. Robert Adare has been convicted of high treason since he went to Scotland to fight with the Covenanters, and has forfeited his lands.
On page 291 May 26th 1641 at Westminster. The King to the Lords Justices for Robert Adair. "Ordering that he be acquitted of an indictment of high treason upon record framed against him in or about June 1639, for joining the National Covenant in Scotland, and of all other offences charged against him and mentioned in his petition." (Public Record Office, England., Calander of State Papers or State Papers - Domestic. III, 447-8.)
followed by - PETITION OF ROBERT ADAIR TO THE KING, shewing that:- He purchased an estate in Ulster, and at the hazard of his life planted it with British. It was "a most barbarous place, and receptacle of rebels." He lived there long, but went to Scotland to care for his estate there in 1639. In June of that year he was indicted of high treason, at the Shire Hall in Carrickfergus, on the charge of joining the King's enemies in Scotland, and plotting a Scotch invasion and rising at Ballymena in Antrim. This indictment is unjust. He prays to be relieved from it. (Ibid, 448 which I did not copy)
followed by "The humble desire of Robert Adair, Esq., in pursuance of the petition hereunto annexed:- 1.That the Lords Justices shall give order to the Judges and law officers that the goods and estate of Robert Adair be freed from the results of the aforesaid indictment. 2.That the Attorney-General be ordered to "confess" Robert Adair innocent, and shall do whatever Adair asks as necessary for his safety. 3.That Adair be given copies of the indictment and charges against him, and a copy of his pardon under the Great Seal of Ireland.
I think his brother, Archibald Adair, Bishop of Killala is mentioned regarding this - 10th April 1640 in Dublin. Archibald Adair, Bishop of Killala) to Lord Conway and Killultagh."Praying for his favour in the matter of a petition enclosed." "Conway Papers.State Papers of Ireland 258, 34."
I believe the "Conway private papers collection" is held in the Public Record Office of North Ireland.Probably that would show the full story.