Fill in the crossword puzzle

123456
Across
  1. 2. royal commands issued by rulers and kings
  2. 3. the period of history before written records
  3. 5. people who study the past and tell others about it
  4. 6. the study of the past through material remains
Down
  1. 1. the study of coins
  2. 2. the study of old inscriptions or epigraphs
  3. 4. the period from when writing was introduced