(This article, apparently from the 1970s, needs referencing. Mr. Denham died in 1971.
Georg Gerster [sic] published books featuring photography of Ethiopian religious sites in the 1970s)

In the mountains of northern Ethiopia stands an ancient centre of the Christian faith. It is the Monastery of Abba Salama. Its founder, Frumentius, a Syrian captured by pirates, became known in Ethiopia as Abba Salama, "Father of Peace". About the year 330 he converted the ruler of the ancient Ethiopian kingdom of Aksum to Christianity and thereafter was named the first chief cleric of the Ethiopian Orthodox Church.
The monastery is not built upon the mountains, but is cut into the stone of a mountain peak. Dr. Georg Gester is the only known foreigner to have climbed the vertical cliff face which leads to the ancient shrine. He was not allowed to enter the church, which takes the form of the classic basilica pattern, but a monk showed him manuscripts and other treasure, including an iron processional cross, which is claimed to have belonged to Frumentius.
This cross has now been copied by Mr. Dewan of Melbourne and will be used in St. John's, Launceston. It will be dedicated as a memorial to the late Laurence Denham, a churchwarden of St. John's and a generous benefactor of the parish and the diocese.