Arcadia vs halcyon days

Arcadia

noun
  • An ideal region of rural and idyllic contentment; a pastoral utopia. 

name
  • A city, the county seat of DeSoto County, Florida, United States 

  • A town, the parish seat of Bienville Parish, Louisiana, United States. 

  • A city in Los Angeles County, California, United States. 

  • A regional unit of Greece in the central and southeastern Peloponnese. Tripoli is the capital and main city with a population over 47,000. 

  • A city in Missouri, United States. 

  • A mountainous region of Ancient Greece, named for Greek mythological hero Arcas; legendary home of the rustic god of nature, Pan. 

halcyon days

noun
  • A period of calm, usually in the past and often nostalgic. 

  • Period of calm during the winter, when storms do not occur. 

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