lyceum vs seat of learning

lyceum

noun
  • A school, especially European, at a stage between elementary school and college, a lycée. 

  • A public hall designed for lectures, readings, or concerts. 

  • An association for literary improvement. 

seat of learning

noun
  • An educational institution. 

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