retinue vs royal household

retinue

noun
  • A group of servants or attendants, especially of someone considered important. 

  • A group of warriors or nobles accompanying a king or other leader; comitatus. 

royal household

noun
  • The immediate family and principal courtiers and servants of a monarch 

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