Iorga became Romanian Premier in April 1931, upon the request of Carol II, who had returned from exile to replace his own son, Michael I. The authoritarian monarch had cemented this relationship by visiting the Vălenii de Munte establishment in July 1930. A contemporary historian, Hugh Seton-Watson (son of R.W. Seton-Watson), documented Carol's confiscation of agrarian politics for his own benefit, noting: "Professor Iorga's immense vanity delivered him into the king's hands." Iorga's imprudent ambition is mentioned by cultural historian Z. Ornea, who also counts Iorga among those who had already opposed Carol's invalidation. In short while, Iorga's support for the controversial monarch resulted in his inevitable break with the PNR and PȚ. Their agrarian union, the National Peasants' Party (PNȚ), took distance from Carol's policies, whereas Iorga prioritized his "Carlist" monarchism. Iorga wfully rejected PNȚ policies. There was a running personal rivalry between him and PNȚ leader Iuliu Maniu, even though Iorga had on his side Maniu's own brother, lawyer Cassiu Maniu.