Parse this person name:

Brian Stephens, 1222-1296, flourished 1243-1262
user
first_name: Brian
last_name: Stephens
middle_names: []
temporal:
- start: 1222
  end: 1296
  type: life_span
- start: 1243
  end: 1262
  type: flourished
titles: []
extra_info: []
assistant