Towards 1909-10 he was affiliated with Joventut Nacionalista, the youth wing of la Lliga Regionalista (the Regionalist League).

Shortly thereafter his political career began, which included terms as the provincial member of parliament for Vic (1917 and 1921).

He was a promoter of Accio Catalana, which he left when the Republic was founded, returning to la Lliga.

In 1936, he moved to Italy, and in 1939 he returned to Catalonia, dedicating himself to the study of history, with special attention to the period of the Catalan counts and its antecedents.

Aside from his early work in the history of law (in 1913 he co-edited with Ferran Valls i Taberner the Usatges de Barcelona (the Usages of Barcelona), notable are some of his main historical works subsequent to 1939: L’abat Oliba, bisbe de Vic, i la seva època (The Abbot Oliba, bishop of Vic, and his Times (1948); Com neix i com creix un gran monestir pirinenc abans de l'any mil: Eixalada-Cuixà ( a 1955 book with research on the Monastery of Saint-André d'Eixalada); Els primers comtes catalans (The first Catalan Counts (1958); Els precedents antics a la historia de Catalunya (The ancient foundations of Catalonia’s history, 1967); Dels visigots als catalans (from the Visigoths to the Catalans, 1969, 1970); and, especially, the many volumes of Catalunya carolingia (Carolingian Catalonia, 1926–52, 1955, 1971).