Birch & Williams 1848, p. 92. "... a pageant which was an elephant with a castle on its back; and it proved a right partus elephantis for it was long a coming; til the running was well entered into and was then as long a creeping about the tilt-yard, all which time the running was intermitted."
Dunboyne 1968, pp. 16–17. "Butler Family Tree condensed" Dunboyne, Patrick Theobald Tower Butler, Baron (1968). Butler Family History (2nd ed.). Kilkenny: Rothe House.{{cite book}}: CS1 maint: multiple names: authors list (link)