Parse this person name:

Justin Claesner, 1354-1397, flourished 1373-1392
user
first_name: Justin
last_name: Claesner
middle_names: []
temporal:
- start: 1354
  end: 1397
  type: life_span
- start: 1373
  end: 1392
  type: flourished
titles: []
extra_info: []
assistant