Parse this person name:

Greco Veltroni, 1812-1856, flourished 1842-1851
user
first_name: Greco
last_name: Veltroni
middle_names: []
temporal:
- start: 1812
  end: 1856
  type: life_span
- start: 1842
  end: 1851
  type: flourished
titles: []
extra_info: []
assistant