Its first known name was Lagania, meaning "land of rock peaks" when it was a village of the Tectosagae in Galatia. During the Roman period Beypazarı was located on important historical passageways between Constantinople, Ancyra and Baghdad.Lagania was the episcopacy center of the Byzantine Empire. The name of the city was changed to Lagania - Anastasiopolis (Anastasios City) in order to honour the visit of the Eastern Roman Emperor Anastasios, who ruled between 491-518.
See:
- Tabula Imperii Byzantini - 4 Galatia und Lykaonia By K. Belke & M. Restle (1984) https://archive.org/details/Tabula-imperii-Byzantini/Tabula%20imperii%20Byzantini/TIB/TIB%204%20Galatien%20und%20Lykaonien%20Belke
- James Rennell, A Treatise on the Comparative Geography of Western Asia: Accompanied with an Atlas of Maps, Tom 2, C.J.G. & F. Rivington, London 1831
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Lagania in: Dictionary of Greek and Roman Geography, illustrated by numerous engravings on wood. William Smith, LLD. London. Walton and Maberly, Upper Gower Street and Ivy Lane, Paternoster Row; John Murray, Albemarle Street. 1854.