Parse this person name:

Bertrand Besnard, 1236-1280, flourished 1251-1266
user
first_name: Bertrand
last_name: Besnard
middle_names: []
temporal:
- start: 1236
  end: 1280
  type: life_span
- start: 1251
  end: 1266
  type: flourished
titles: []
extra_info: []
assistant