Parse this person name:

Justin van Ommeren (1366-1418, flourished 1387-1403)
user
first_name: Justin
last_name: van Ommeren
middle_names: []
temporal:
- start: 1366
  end: 1418
  type: life_span
- start: 1387
  end: 1403
  type: flourished
titles: []
extra_info: []
assistant