Penyberth was a 250 acre farm situated on the Llyn Peninsula near Pwllheli. The farmhouse was destroyed in 1936 in order to build a training camp and aerodrome for the RAF. On 8th September 1936, the training school building was set on fire as a protest against the destruction of a place of Welsh cultural heritage. Plaid Genedlaethol Cymru members Saunders Lewis, Lewis Valentine, and D.J. Williams claimed responsibility.

Associated with:
Penrhos Airfield: Nprn, 306520.