Other iron keys are found in England and France, the application of which is more doubtful. They are found chiefly in connection with Celtic remains, and by some have been supposed to be keys for opening doors fastened with a simple latch on the inside.[8] Such latches were certainly employed amongst the earliest systems of door-fastenings, and the keys in question might have served the purpose of opening them, but they might also have been used to open locks with a single wooden tumbler; the simpler kinds resemble somewhat our modern pick-locks, of which fig. 28B, Plate III., is a specimen. Fig. 29B, Plate III., in my collection is from a Germano-Roman tomb near Niderolm, and was obtained at Mayence; its possible use, in the manner represented in fig. 9B, Plate II., is obvious. Figs. 30B and 31B, Plate III., are two Anglo-Saxon keys found at Sarr, in Kent.[9] Figs. 32B, 33B, Plate III., are two keys of the Iron Age from Bornholm, in the Baltic,[10] attributed by M. VIDEL to the 3rd or 4th century of our era. Fig. 34B, Plate IV., is a somewhat similar one from Caerwent, in Wales.[11] It has a flat handle and appears to be adapted to be pressed downwards as if for opening a latch. Figs. 35B, 36B, Plate IV., are nearly similar ones, and were discovered in the Roman Villa at Hartlip, in Kent.[12] [8] Ibid., p. 320. [9] Paper by JOHN BRENT, Esq., in the fifth volume of 'Archæologia Cantiana,' p. 312. [10] 'Mémoires de la Société Royale des Antiquaries du Nord,' 1872-77, Plate VIII., figs. 1 and 2. [11] 'Isca Silurum,' by JOHN E. LEE, F.S.A., Plate XXXVI., fig. 1. [12] C. ROACH SMITH'S 'Collectanea Antiqua,' vol. ii., Plate VI., figs. 2 and 3, p. 20.