Josep Caixal i Estradé (1803–1879) was Bishop of Urgell from 1853 until his death in Rome in 1879 and co-prince of Andorra during the New Reform period.

He attended the First Vatican Council during 1869-1870 (Vaticanum I), where he participated in the drafting of the structure of faith, and in discussions on the infallibility of the Pope, and the composition of the Church, as well as other issues of disciplinary nature.

During the reign of Amadeo I, he represented the ecclesiastical province of Tarragona (1870-1872) in the Senate[3] and became well known for his defense of Catholic unity in Spain.

Once the Republic was proclaimed (1873), he moved to Andorra, and from there to Navarre, in order to serve in the field as vicar general to the Carlists who had taken arms.

Pope Pius IX gave him the title of honorary Roman, and he became an aide to the Pontifical Throne.