With Alfred Darimon, Jules Favre, JL Hénon and Ernest Picard he formed a group known as Les Cinq (the Five), which wrung from Napoleon III some concessions in the direction of constitutional government.

The imperial decree of 24 November, permitting the insertion of parliamentary reports in the Moniteur, and an address from the Corps Législatif in reply to the speech from the throne, were welcomed by him as an initial piece of reform.

This marked a considerable change of attitude, for only a year previously he attacked the imperial government, in the course of a defence of Étienne Vacherot, brought to trial for the publication of La Démocratie.

[1] On the last day of December 1866, Count AFJ Walewski, continuing negotiations begun by the duc de Morny, offered to make Ollivier the Minister of Education, representing the general policy of the government in the Chamber.

The imperial decree of 19 January 1867, together with the promise inserted in the Moniteur of a relaxation of the stringency of the press laws and of concessions in respect of the right of public meeting, failed to satisfy Ollivier's demands, and he refused the office.

The sénatus-consulte of 8 September 1869 gave the two chambers ordinary parliamentary rights, and was followed by the dismissal of Eugène Rouher and the formation in the last week of that year of a ministry of which Ollivier was really premier, although that office was not nominally recognized by the constitution.

[2] The new cabinet, known as the ministry of 2 January, had a hard task before it, complicated a week after its formation by the shooting of Victor Noir, a Republican journalist, by Pierre Napoleon Bonaparte, the Emperor's cousin.

The riots following the murder were suppressed without bloodshed; circulars were sent round to the prefects forbidding them to put pressure on the electors in favour of official candidates; Baron Haussmann was dismissed from the prefecture of the Seine département.

[3] The violent press campaign against the emperor, to whom he had promised a happy old age, was broken by the prosecution of Henri Rochefort; and on 20 April a sénatus-consulte was issued which accomplished the transformation of the Empire into a constitutional monarchy.

He was outmanoeuvered by Otto von Bismarck, and on 15 July he made a hasty declaration in the Chamber that the Prussian government had issued to the powers a note announcing the rebuff received by Benedetti, the Ems Dispatch.