Parse this person name:

Grégoire Monnier, 1218-1271, flourished 1235-1258
user
first_name: Grégoire
last_name: Monnier
middle_names: []
temporal:
- start: 1218
  end: 1271
  type: life_span
- start: 1235
  end: 1258
  type: flourished
titles: []
extra_info: []
assistant