Sir Lucas Dillon of Loughglynn (1579–1656) was in 1628 one of the negotiators of the Graces; he was MP for Roscommon in the two Irish Parliaments of Charles I.
His father's family was Old English and descended from Sir Henry Dillon who came to Ireland with Prince John in 1185.
[9] On 15 September 1643 at Sigginstown, Strafford's unfinished house,[10] the Confederates signed a cease-fire with Ormond, called the "Cessation".
[15] The Irish Catholic Confederation was dissolved,[16] and power handed to 12 Commissioners of Trust of which Sir Lucas was one.
[17] On 2 August Jones defeated the Irish royalists under Ormond, who had been besieging Dublin, at the Battle of Rathmines.