Parse this person name:

Hellwig Holsten, Steffi Uta L. Michel Rigo U., 1264-1317
user
first_name: Steffi
last_name: Hellwig Holsten
middle_names:
- Uta
- L.
- Michel
- Rigo
- U.
temporal:
- start: 1264
  end: 1317
  type: life_span
titles: []
extra_info: []
assistant