Of course. It is a very known Arab fort of the Byzantine border, mentioned in a lot of sources. It was close to a mountain pass. The Byzantines knew it as Adata. Armenians allegedly knew it as Kaytuk. For some times it was also known as Al-Muhammadiyya and Al-Mahdiyya. It is located between Germanikea (Mar'ash), Melitene (Malatya) and Samosata (Samsat). It was known as Red due to the colour of the local soil. It was founded allegedly in circa 778-779. Its name allegedly refers to a heavy Arab defeat during the Umayyads. It was located sonewhere around Inekli lake, probably the same as the Lake of Al-Hadath. I think west, south-west of the lake. Cheynet says it's Seraykoy *with umlauts. I cannot find such village, perhaps it's Sakarkaya koyu. Eger, on another hand, says it's Dozlar village. The coordinates are approximately 37.69-36.70N, 37.50-37.44 E. I can give you bibliographical info if you want.