Conversation so far:
when did Luigi Luzzatti become prime minister?
1909 .
what was he doing before he became prime minister?
minister of agriculture.
was he good as prime minister?
he showed lack of energy in dealing with opposition and tried to avoid all measures likely to make him unpopular.
For how long was he prime minister?
1911.
What else made him unpopular as Prime Minister?
he was consistently pro-Ally and strongly supported Italian intervention, but his tone was on the whole pessimistic.
What good things did he do as Prime Minister?
he was always consulted on all financial matters, and his sound advice was generally followed.
What else is interesting about him?
He became treasury minister in the second incarnation of the Nitti cabinet .

Question: When did he become the treasury minister?
Self-contained rewrite: When did Luigi Luzzatti become the treasury minister?