Angus

The Anguses, Irish Mac Aonghusa, son of Angus, later Magennis, were a Gaelic kindred of eastern Ulster. From the twelfth century they were chiefs of Iveagh in County Down, based at Rathfriland and inaugurated on Knock Iveagh. Aedh Mor Magennis witnessed Newry Abbey's charter in 1153.

They allied with the Norman Earldom of Ulster until its collapse after 1333, then pushed Iveagh east to Dundrum by the fifteenth century. Henry VIII knighted two chiefs in 1542 under surrender and regrant, yet Art Roe Magennis joined Hugh O'Neill in the Nine Years' War and submitted after Mountjoy ravaged Iveagh.

In 1607-1610 the Crown broke Iveagh into fifteen freeholds. Art Roe became Lord Iveagh in 1623, but the estates passed to English speculators; by 1700 the lordship was shared between the Magennises, McCartans and new planters.