This, briefly stated, is the genealogy of the Fitzgeralds as given
by the supporters of the Irish origin of the Mackenzies, and it
may be right or wrong for all we need care in discussing the origin
of the Mackenzies. Its accuracy will, however, be proved impossible.

According to the true genealogy, Thomas, who was the third son of
Maurice, married Rohesia, heiress of Woodstock, near Athy, and
daughter of Richard de St. Michael, Lord of Rheban. By this lady
he had an only son, John, who succeeded as 6th Baron Offaly, and
was in 1316 created 1st Earl of Kildare. John married Blanche,
daughter of John Roche, Baron of Fermoy; not the two ladies given
him in the Fitzgerald-Mackenzie genealogy.

The real authentic genealogy of the Fitzgeralds, from whom the
Dukes of Leinster and other Fitzgerald families are descended, is
as follows: The first,

I. OTHO, known as "Dominus Otho," belonged undoubtedly to the
Gherardini family of Florence. He passed into Normandy, and in 1057
crossed into England, became a favourite with Edward the Confessor,
and obtained extensive estates from that monarch. He had a son

II. WALTER FITZ OTHO, or son of Otho. He is mentioned in Domesday
Book in 1078 as being then in possession of his father's estates. He
was Castellan of Windsor and Warden of the Forests in Berkshire. He
married Gladys, daughter of Rhiwallon ap Cynfyn, Prince of North
Wales, and had three sons, the eldest being

III. GERALD FITZ WALTER, or son of Walter, who was appointed by