Parse this person name:

Mirthe van Beek, 1217-1288, flourished 1240-1261
user
first_name: Mirthe
last_name: van Beek
middle_names: []
temporal:
- start: 1217
  end: 1288
  type: life_span
- start: 1240
  end: 1261
  type: flourished
titles: []
extra_info: []
assistant