Parse this person name:

Stefan van Wassenaar, 1515-1559, flourished 1536-1554
user
first_name: Stefan
last_name: van Wassenaar
middle_names: []
temporal:
- start: 1515
  end: 1559
  type: life_span
- start: 1536
  end: 1554
  type: flourished
titles: []
extra_info: []
assistant