¹¹⁵Petrie, George. "On the History and Antiquities of Tara Hill." The Transactions of the Royal Irish Academy, vol. 18, 1839, p. 159.

Petrie wrote that, in his time, the Mound of the Hostages was "still popularly called Bod Fhearghais, that is, Penis Fergusii, an appellation derived from the form of [the Lia Fáil]."

The standing stone, which seems to have been sculpted with that intent, aptly illustrates one of the reputed characteristics of the noble Fergus mac Róich, as laid out in the "Heptad of Fergus:" translated below by Whitley Stokes, who extracted it from within the Ulster Cycle as preserved in the 12th-century Book of Leinster:

"...Seven feet between his ear and his lips,
And seven fists [distance] between his eyes,
And seven fists in his nose,
And seven fists in his lips.
The full of a bushel-cup was the moisture of his head when being washed.
Seven fists in his penis.
A bushel-bag in his scrotum.
Seven women to curb him unless Flidais [his wife] should come.
Seven pigs and seven vats (of ale) and seven deer to be consumed by him,
And the strength of seven hundred in him.
..."

(Stokes, Whitley. Tidings of Conchobar Mac Nessa. London, 1908.) More about Fergus here.