Part of the Liverpool and Holyhead Telegraph (NPRN 300822).
Built in 1840 to supercede that on Mynydd Llaneilian (NPRN 300830); rebuilt in 1855. L-shaped building, converted to a private house, 'The Old Telegraph'.
Source: Faster than the Wind: The Liverpool to Holyhead Telegraph; Frank Large; Avid Publications; 1998.
B.A.Malaws, RCAHMW, 14 September 2000.

Named as Pant-y-groes on OS County series (Anglesey III.12 1889).