Background: Mag Aonghusa or Mag Aonghuis (son of Angus) of Iveagh. One of the leading septs of Ulster. The world-famous brewers descend from a junior branch.
Variations: MacGuinness, MacGenis, Guinness, Magennis.
More Info: http://heraldry.celticradio.net/search.php?id=185
Discussion of this family is welcomed.
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