Pope Pius X publishes the encyclical Vehementer Nos.

Pope Pius X was head of the Catholic Church from 4 August 1903 until his death in August 1914. Pius X is known for vigorously opposing modernist interpretations of Catholic doctrine, and for promoting liturgical reforms and Thomist scholastic theology. He initiated the preparation of the 1917 Code of Canon Law, the first comprehensive and systemic work of its kind, which was ultimately promulgated by his successor. He is venerated as a saint in the Catholic Church.

Vehementer Nos was a papal encyclical promulgated by Pope Pius X on 11 February 1906. He denounced the French law on the Separation of the Churches and the State enacted two months earlier. He condemned its unilateral abrogation of the Concordat of 1801 between Napoleon I and Pope Pius VII that had granted the Catholic Church a distinctive status and established a working relationship between the French government and the Holy See. The title of the document is taken from its opening words in Latin, which mean "We with vehemence".

February 11 is the 42nd day of the year in the Gregorian calendar; 323 days remain until the end of the year.