atabeg vs sanjakbey

atabeg

noun
  • A high medieval Turkish feudal title, originally charged with the caretaking and mentoring of the realm's crown prince. 

sanjakbey

noun
  • An official of the Ottoman Empire who oversaw a sanjak. 

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