Conversation so far:
When did Luigi Luzzatti become prime minister?
With the resignation of Sidney Sonnino, Luigi Luzzatti was called upon to form a cabinet himself. His administration lasted until March 18, 1911.
What was Luigi Luzzatti doing before becoming prime minister?
Luigi Luzzatti was minister of agriculture in the second Sidney Sonnino Cabinet from 1909 to 1910.
Was Luigi Luzzatti good as prime minister?
Luigi Luzzatti didn't have the character necessary to lead a government: he lacked of energy in dealing with opposition and tried to avoid all measures likely to make him unpopular.
For how long was Luigi Luzzatti prime minister?
Luigi Luzzatti's administration, which lasted until March 18, 1911, was not very successful and fell over a proposed electoral reform.
What else made Luigi Luzzatti unpopular as Prime Minister?
Luigi Luzzatti never realized that with the chamber, as it was then constituted, he only held office at former Prime Minister Giovanni Giolitti's good pleasure.
What good things did Luigi Luzzatti do as Prime Minister?
During the First World War, Luigi Luzzatti was consistently pro-Ally and strongly supported Italian intervention.
What else is interesting about Luigi Luzzatti besides time as prime minister besides when, if he was good, how long he was prime minister, what made him unpopular, and what good things he did as prime minister?
Luigi Luzzatti was the first Venetian and second Jewish Prime Minister of Italy after Alessandro Fortis.

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