Parse this person name:

Oswald Döhn, 1251-1294, flourished 1275-1289
user
first_name: Oswald
last_name: Döhn
middle_names: []
temporal:
- start: 1251
  end: 1294
  type: life_span
- start: 1275
  end: 1289
  type: flourished
titles: []
extra_info: []
assistant