The Tullycommon Bone (CIIC 52)[1] is an archaeological find, discovered in 1934 during excavations of the fortification of Cahercommaun in the townland of Tullycommon (Irish: Tulach Chumann), County Clare, Ireland. It is a complete metacarpal bone of a sheep with an Ogham inscription on each side. The find dates from the 7th to the 10th century.[2]