Parse this person name:

Celso Dueñas (1218-1287, flourished 1248-1268)
user
first_name: Celso
last_name: Dueñas
middle_names: []
temporal:
- start: 1218
  end: 1287
  type: life_span
- start: 1248
  end: 1268
  type: flourished
titles: []
extra_info: []
assistant