long ago vs subsequently

long ago

adv
  • At a time in the past, especially the distant past. 

adj
  • Existing in the relatively distant past. 

subsequently

adv
  • Following, afterwards in either time or place. 

  • Accordingly, therefore (implying a logical connection or deduction), consequently. 

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