Parse this person name:

Aaron Keijser (1241-1320, flourished 1258-1273)
user
first_name: Aaron
last_name: Keijser
middle_names: []
temporal:
- start: 1241
  end: 1320
  type: life_span
- start: 1258
  end: 1273
  type: flourished
titles: []
extra_info: []
assistant