HALYBURTON, JAMES (1518-1589), Scottish reformer, was one of the lords of the congregation in 1557, and commanded the contingents sent by Forfar and Fife against the queen regent in 1559. He took part in the defence of Edinburgh, and in the battles of Langside (1568) and Restalrig (1571), where he was captured by Mary's troops. He represented Morton at the con ference of 1578, and was one of the royal commissioners to the General Assembly in 1582 and again in 1588.