Parse this person name:

William Eigenwillig, 1220-1279, flourished 1235-1255
user
first_name: William
last_name: Eigenwillig
middle_names: []
temporal:
- start: 1220
  end: 1279
  type: life_span
- start: 1235
  end: 1255
  type: flourished
titles: []
extra_info: []
assistant