"XIV Centenary of Monte Cassino Abbey" founded by Saint Benedict of Nursia (San Benedetto da Norcia). 1929 stamps of Italy with changed colors overprinted for use in Cyrenaica (eastern region of the Italian Colony of Libya) the same year. The same stamps exist overprinted for use in Tripolitania (western region of the Italian Colony of Libya).
More information in: http://en.wikipedia.org/wiki/Monte_Cassino
More information in: http://en.wikipedia.org/wiki/Monte_Cassino