Parse this person name:

Launay Riou, Alphonse Bertrand Tristan, 1271-1291
user
first_name: Alphonse
last_name: Launay Riou
middle_names:
- Bertrand
- Tristan
temporal:
- start: 1271
  end: 1291
  type: life_span
titles: []
extra_info: []
assistant