Parse this person name:

Lucie U. Duval, Leconte-sur-Mer, 1284-1336
user
first_name: Lucie
last_name: Duval
middle_names:
- U.
temporal:
- start: 1284
  end: 1336
  type: life_span
titles: []
extra_info:
- Leconte-sur-Mer
assistant