Previously the Cagayan College of Law, it became a unit of Ateneo de Cagayan in 1956.Offering one of the best law programs in the country, its alumni roster includes Senator Aquilino “Nene” Pimentel who graduated in 1959.Justice Jose Sabio had also been among its faculty members.
The college won the championship in debate at the Supreme Court Centenary Celebration and was 1st runner up in the 1st Supreme Court National Moot Competition.The XU team also won in the second Philippine Moot Court Competition on International Humanitarian Law and represented the Philippines in the 5th Asian IHL Moot Court Competition in HongKong in 2007.