The 1909 death of Carlos VII turned political fortunes of de Cerralbo, who consulted by the new claimant Don Jaime advised that as a Carlist king he should adopt the name of Jaime III. Many distinguished Carlists pressed the pretender to dismiss Feliú and re-appoint Cerralbo. The claimant bowed to the pressure in 1912, creating a collective governing body,
Junta Superior Central Tradicionalista, with de Cerralbo as its president. A number of authors claim that de Cerralbo was the de facto Jefe Delegado and the press, like many contemporaries, presented him as such. The competitive theory maintains that de Mella, sensing the forthcoming clash with Don Jaime, assumed that aging and sick Cerralbo, his old-time friend, would be easier to manipulate; some claim that following the appointment it was actually de Mella who was running the party. De Cerralbo returned to his conciliatory policy towards other conservative parties; he also resumed tours across Spain, and re-organized the party by creating 10 commissions. A novelty in party tactics was an attempt to emphasize its public presence by organizing
romerías,
aplecs and pilgrimages, also abroad. It was during his second tenure that
Requete was born, shaped by Llorens as the paramilitary organization. De Cerralbo remained perfectly loyal to the claimant, though Don Jaime was increasingly uneasy about the growing position of de Mella, which led to clashes related to management of
Correo Español. As the
European war broke out in 1914 de Cerralbo favored Spanish neutrality, though he sympathized with the
Central Powers, considering their monarchical model closer to Carlist ideal and traditionally opposing
Great Britain, viewed as arch-enemy of Spain. He had to face a hard task of maintaining Carlist unity, as some in the movement, including the claimant himself, favored the
Allies. Another dispute de Cerralbo had to defuse took place in
Catalonia and was related to politics towards local nationalism, resulting in
Miquel Junyent i Rovira appointed the local jefe. The most difficult issue, however, was the growing conflict between de Mella and Jaime III. Unable to sort out the loyalty dilemma, plagued by health problems and embittered by attacks of his former friends, in the spring of 1918 de Cerralbo quoted health reasons and resigned. When the
Mellistas broke away in 1919, De Cerralbo, already outside the Carlist leadership, did not take a clear stand; instead, he withdrew from politics altogether. Though Don Jaime refrained from open criticism, privately he did not spare de Cerralbo harsh words, repeated in public by other prominent
Jaimistas; it was de Mella who spoke in his defense. Cerralbo did not take part in the 1919
Magna Junta de Biarritz, a congregation entrusted with marking the future direction of Carlism. His last public nomination was appointment to
alcalde of the Madrid district of
Argüelles in 1920. ==Archaeologist and historian==