Use by Ruaidhrí  (Rory) Ó Caisaide (Cassidy) of Arabic Numerals in The Annals Of Ulster, 1489-1504, through Families Familiarity with Arabic Medical Treatises, Ó Casiade was a member of a Fermanagh Medical Family, hereditary physicians to the Maguire family.

Ó Casiade was a member of a Fermanagh Medical Family hereditary physicians to the Maguire family.

From Daniel Mccarthy’s TCD MS 1882 (The Annals aoaf Ulster).

Courtesy Four Courts Press:

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