Byzantine Greek vs Medieval Greek

Byzantine Greek

name
  • Collectively, the continuum of forms of the Greek language as written and spoken during the time of the Byzantine Empire (C.E. 330–1453), preceded by Koine Greek and Early Medieval Greek and succeeded by Late Medieval Greek to Modern Greek. (ISO 639-3 code: grc shared with Classical Greek.) 

Medieval Greek

name
  • Collectively, the continuum of forms of the Greek language as written and spoken during medieval times, preceded by Hellenistic Koine Greek and succeeded by Modern Greek 

How often have the words Byzantine Greek and Medieval Greek occurred in a corpus of books? (source: Google Ngram Viewer )