Parse this person name:

Lenn Billung (1423-1496, flourished 1453-1471)
user
first_name: Lenn
last_name: Billung
middle_names: []
temporal:
- start: 1423
  end: 1496
  type: life_span
- start: 1453
  end: 1471
  type: flourished
titles: []
extra_info: []
assistant