Parse this person name:

Kristian Gröttner (1229-1306, flourished 1248-1267)
user
first_name: Kristian
last_name: Gröttner
middle_names: []
temporal:
- start: 1229
  end: 1306
  type: life_span
- start: 1248
  end: 1267
  type: flourished
titles: []
extra_info: []
assistant