Parse this person name:

van Boulogne van den Assem, Lot Fabiënne, 1234-1274
user
first_name: Lot
last_name: van Boulogne van den Assem
middle_names:
- Fabiënne
temporal:
- start: 1234
  end: 1274
  type: life_span
titles: []
extra_info: []
assistant