4Smith, Charles. The Antient and Present State of the County and City of Cork: In Four Books ... Vol. 1. Dublin: Printed by A. Reilly for the Author, and Sold by J. Exshaw, 1750. 166-67. This selection may be read here.
A topographical dictionary in 1837 described Cairn Thierna: "The Lords cairn or pile, so named, according to some, from having been the place where the Tierna or chieftain assembled his followers and chose their leaders; or, according to others, from having been a place of pagan worship to the sun." (Lewis, Samuel. "Rathcormac Civil Parish." A Topographical Dictionary of Ireland: Comprising the Several Counties, Cities, Boroughs, Corporate, Market, and Post Towns, Parishes, and Villages, with Historical and Statistical Descriptions. London: Lewis, 1837.)