 Although he repaired and adapted it, Sir Andrew Corbet decided to retain this important defensive feature.Above the arch, his monogram and the date 1579 are carved on a square stone, surmounting another rectangular stone bearing the family crest of an elephant and castle in relief.As Corbet died on 16 August 1578, the carving must have been added to the building after his death, suggesting that it was still unfinished.