Peirce Ó Caiside was a Gaelic-Irish physician and writer, died 1504.
Ó Caiside was a member of a medical family of Fermanagh. The Annals of Ulster, sub anno 1504, state:
His father bore the same name as the 18th-century friar, soldier and poet Tomás Ó Caiside, whose parents were natives of Ulster.
References
Peirce Ó Caiside Wikipedia(Text) CC BY-SA