Parse this person name:

Léon Chevalier, 1455-1523, flourished 1478-1490
user
first_name: Léon
last_name: Chevalier
middle_names: []
temporal:
- start: 1455
  end: 1523
  type: life_span
- start: 1478
  end: 1490
  type: flourished
titles: []
extra_info: []
assistant