Saionji was made a
genrō by imperial command in December 1912, joining Yamagata Aritomo,
Inoue Kaoru,
Matsukata Masayoshi, and
Ōyama Iwao. As the only member of the group from the court nobility (
kuge), and the last man to be so appointed, his elevation was a direct result of the Taishō Crisis. It was intended to strengthen the position of the
genrō by bringing a younger, more liberal figure into their ranks who could command the support of the political parties. As a
genrō, Saionji's primary function was to advise the emperor on the selection of the prime minister. His influence, initially secondary to that of the more powerful Yamagata, grew steadily over time. After the collapse of Katsura's third cabinet in February 1913, Saionji played a key role in the selection of Admiral
Yamamoto Gonnohyōe as his successor, cementing an alliance between the Seiyukai and the navy-Satsuma faction. In June 1914, Saionji officially retired as president of the Seiyukai and withdrew from active politics, though he continued to exert considerable influence behind the scenes.
Paris Peace Conference (1919) in 1919 In December 1918, Saionji was appointed chief plenipotentiary of the Japanese delegation to the
Paris Peace Conference. His selection was based on his high public prestige, his internationalist reputation, and his personal connections with Western leaders, which were seen as crucial for navigating the complex post-war diplomatic environment. Saionji was a firm believer in international cooperation and a strong supporter of the newly formed
League of Nations, a position that often put him at odds with more nationalist elements in the Japanese government. During this period, he also acted as a mentor to the young Prince
Konoe Fumimaro, whom he had invited to join the delegation. Saionji was disconcerted, however, when Konoe published an essay critical of the emerging Anglo-American-led world order, and he privately warned his protégé to keep such views to himself. In Paris, Saionji's role was largely that of a figurehead and mediator. While he did not participate directly in the main negotiations of the
Council of Four (as he was not a head of state), he used his influence to guide the Japanese delegation, coordinate its positions, and defend its decisions against criticism from Tokyo. His two main objectives were to secure Japan's control over former German concessions in China's
Shandong province and the Pacific, and to insert a
Racial Equality Proposal into the
Covenant of the League of Nations. The racial equality clause was defeated due to strong opposition from the British Dominions and the United States. In the face of a threatened Japanese walkout, U.S. President
Woodrow Wilson ultimately conceded on the Shandong issue. Saionji used his long-standing friendship with French Prime Minister
Georges Clemenceau to secure a favourable outcome for Japan. Despite instructions from Tokyo to make Japan's participation in the League conditional on these demands, Saionji was prepared to subordinate them to ensure Japan's entry into the new international order. His leadership at the conference cemented his reputation as a leading internationalist statesman and enhanced his prestige within the
genrō.
Last of the genrō (1924–1932) The death of Yamagata in 1922 and Matsukata in 1924 left Saionji as the sole surviving
genrō. During this period, his influence reached its zenith. He consolidated his power by securing the appointment of his liberal allies to key positions within the Imperial Court, effectively making the court a stronghold of the "Saionji group". This group, which included
Makino Nobuaki,
Ichiki Kitokurō, and
Yuasa Kurahei, dominated the palace and advised the Emperor in line with Saionji's constitutional monarchist and internationalist principles. When Prime Minister
Hara Takashi was assassinated in 1921, Saionji refused the premiership, which led to the appointment of
Takahashi Korekiyo. After Takahashi's brief ministry fell, Saionji turned to Admiral
Katō Tomosaburō and then to Admiral
Yamamoto Gonnohyōe, in part because the major parties were in disarray and also because of his desire for a fair election. From 1924 to 1932, Saionji oversaw a period of party-based government that he termed the "normal course of constitutional government" (憲政の常道,
kensei no jōdō). He consistently recommended the leader of the majority party in the Diet as prime minister, beginning with the appointment of
Katō Takaaki in 1924. While he often had misgivings about the abilities of the party leaders, as well as a personal distaste for Katō, he believed that this process was essential for the maturation of Japan's constitutional system. The foreign policy of this period, known as "Shidehara diplomacy" after Foreign Minister
Shidehara Kijūrō, was closely aligned with Saionji's own views. It emphasized international cooperation, particularly with Britain and the United States, economic expansion over military intervention, and a policy of non-interference in China's domestic affairs.
Confronting militarism (1928–1936) The late 1920s and early 1930s saw the rise of militarism and a growing challenge to the liberal order Saionji represented. The assassination of the Manchurian warlord
Zhang Zuolin by the
Kwantung Army in 1928 marked a turning point. Saionji, outraged by the army's insubordination, insisted that Prime Minister
Tanaka Giichi punish the responsible officers. When Tanaka failed to do so, Saionji orchestrated the downfall of his cabinet by having the Emperor express his displeasure, a rare and powerful use of imperial authority. Following Tanaka's fall, he recommended
Hamaguchi Osachi as prime minister. In 1930, Saionji and his allies faced another major challenge during the
London Naval Treaty controversy. The government's decision to accept a compromise on naval ratios that was opposed by the Naval General Staff sparked a major political crisis. Saionji strongly supported the treaty, seeing it as essential for both Japan's economy and its relations with the West. He mobilised the "Saionji group" at court to support the government, and in a series of complex political manoeuvres, successfully overcame the opposition of the military and the Privy Council to secure the treaty's ratification. The
Mukden Incident in September 1931 and the subsequent military takeover of Manchuria presented Saionji with his gravest challenge yet. While he and the government attempted to contain the army's actions, they were ultimately unsuccessful. Unlike in the past, Saionji refused to use the Emperor's authority to directly confront the military. He believed that the army's actions had wide public support and that any attempt at imperial intervention would not only fail but would also damage the prestige of the throne and undermine the constitutional system itself, fearing for the preservation of the monarchy from military radicalism. This rationale guided his decision in the aftermath of the
May 15 Incident in 1932, when Prime Minister
Inukai Tsuyoshi was assassinated. Believing that no party leader could command the necessary national unity, and deeply distrustful of the Seiyukai's new, reactionary leader
Suzuki Kisaburō, Saionji maneuvered for the creation of a "national unity" cabinet under Admiral
Saitō Makoto. This decision effectively ended the era of party-led cabinets until after the
Second World War. This decision marked a significant shift in his approach, reflecting his recognition that the balance of power had decisively shifted away from the liberal establishment. The 1935 "Minobe organ theory controversy", a right-wing attack on the liberal constitutional theories of
Minobe Tatsukichi, was another major blow. Saionji and the Emperor both supported Minobe, seeing the affair as a politically motivated attack on the constitutional monarchist system and the "Jushin" (senior statesmen) around the throne. However, the government was eventually forced to make concessions to the right-wing forces. The climax of this period of rising militarism came with the
February 26 incident of 1936, a military coup attempt in which several of Saionji's closest allies, including
Saitō Makoto and
Takahashi Korekiyo, were assassinated. Saionji himself was a target, but was not attacked. The incident shattered the power of the liberal group and marked the effective end of Saionji's ability to influence the direction of Japanese politics. == Final years and death (1937–1940) ==